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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2012	Oct. 22, 2012
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Trading Symbol	RRC
Entity Registrant Name	RANGE RESOURCES CORP
Entity Central Index Key	0000315852
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		162,629,126

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 151	$ 92
Accounts receivable, less allowance for doubtful accounts of $1,635 and $4,015	120,120	127,180
Unrealized derivative gain	131,841	173,921
Inventory and other	18,423	14,070
Total current assets	270,535	315,263
Unrealized derivative gain	20,648	77,579
Equity method investments	135,867	138,130
Natural gas and oil properties, successful efforts method	8,000,845	6,784,027
Accumulated depletion and depreciation	(1,942,698)	(1,626,461)
Natural gas and oil properties, successful efforts method,net	6,058,147	5,157,566
Transportation and field assets	117,364	123,349
Accumulated depreciation and amortization	(73,142)	(70,671)
Transportation and field assets,net	44,222	52,678
Other assets	128,301	104,254
Total assets	6,657,720	5,845,470
Current liabilities:
Accounts payable	318,492	311,369
Asset retirement obligations	5,005	5,005
Accrued liabilities	133,369	109,109
Liabilities of discontinued operations		653
Deferred tax liability	37,300	56,595
Accrued interest	47,284	29,201
Unrealized derivative loss	4,294
Total current liabilities	545,744	511,932
Bank debt	461,000	187,000
Subordinated notes	2,388,869	1,787,967
Deferred tax liability	656,849	710,490
Unrealized derivative loss	8,939	173
Deferred compensation liability	198,082	169,188
Asset retirement obligations and other liabilities	116,410	86,300
Total liabilities	4,375,893	3,453,050
Commitments and contingencies
Stockholders' Equity
Preferred stock, $1 par, 10,000,000 shares authorized, none issued and outstanding
Common stock, $0.01 par, 475,000,000 shares authorized, 162,592,198 issued at September 30, 2012 and 161,302,973 issued at December 31, 2011	1,626	1,613
Common stock held in treasury, 131,158 shares at September 30, 2012 and 171,426 shares at December 31, 2011	(4,879)	(6,343)
Additional paid-in capital	1,903,249	1,866,554
Retained earnings	314,534	373,969
Accumulated other comprehensive income	67,297	156,627
Total stockholders' equity	2,281,827	2,392,420
Total liabilities and stockholders' equity	$ 6,657,720	$ 5,845,470

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Allowance for doubtful accounts on accounts receivable	$ 1,635	$ 4,015
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	475,000,000	475,000,000
Common stock, shares issued	162,592,198	161,302,973
Common stock held in treasury, shares	131,158	171,426

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues and other income:
Natural gas, NGLs and oil sales	$ 337,040	$ 304,230	$ 953,006	$ 841,546
Derivative fair value (loss) income	(40,728)	65,761	47,008	77,966
Gain (loss) on the sale of assets	949	203	(12,704)	(1,280)
Other	(2,368)	442	(3,084)	357
Total revenues and other income	294,893	370,636	984,226	918,589
Costs and expenses:
Direct operating	29,628	29,828	85,691	87,054
Transportation, gathering and compression	51,600	32,431	137,164	86,179
Production and ad valorem taxes	8,819	7,317	57,239	21,746
Exploration	14,752	17,606	51,785	56,385
Abandonment and impairment of unproved properties	40,118	16,627	104,048	52,064
General and administrative	44,497	35,907	127,231	108,986
Deferred compensation plan	20,052	8,717	21,555	33,569
Interest expense	43,997	34,181	124,090	90,343
Loss on early extinguishment of debt		(4)		18,576
Depletion, depreciation and amortization	123,059	93,619	332,012	244,129
Impairment of proved properties and other assets	1,281	38,681	1,281	38,681
Total costs and expenses	377,803	314,910	1,042,096	837,712
(Loss) income from continuing operations before income taxes	(82,910)	55,726	(57,870)	80,877
Income tax (benefit) expense
Current		(7)		1
Deferred	(29,074)	22,547	(17,910)	35,345
Total income tax expense	(29,074)	22,540	(17,910)	35,346
(Loss) income from continuing operations	(53,836)	33,186	(39,960)	45,531
Discontinued operations, net of taxes		1,569		15,484
Net (loss) income	$ (53,836)	$ 34,755	$ (39,960)	$ 61,015
(Loss) income per common share:
Basic-(loss) income from continuing operations	$ (0.34)	$ 0.21	$ (0.25)	$ 0.28
-discontinued operations		0.01		0.10
-net (loss) income	(0.34)	0.22	(0.25)	0.38
Diluted-(loss) income from continuing operations	(0.34)	0.20	(0.25)	0.28
-discontinued operations		0.01		0.10
-net (loss) income	(0.34)	0.21	(0.25)	0.38
Dividends per common share	$ 0.04	$ 0.04	$ 0.12	$ 0.12
Weighted average common shares outstanding:
Basic	159,563	158,154	159,297	157,901
Diluted	159,563	159,322	159,297	158,939

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2012

Sep. 30, 2011

Net (loss) income

$ (53,836)

$ 34,755

$ (39,960)

$ 61,015

Other comprehensive income:

Realized loss (gain) on hedge derivative contract settlements reclassified into earnings from other comprehensive income, net of taxes

^[1]

(37,495)

(16,724)

(120,871)

(55,791)

Change in unrealized deferred hedging (losses) gains, net of taxes

(52,246)

56,993

31,541

74,530

Total comprehensive (loss) income

$ (143,577)

$ 75,024

$ (129,290)

$ 79,754

[1]	For realized gains upon derivative contract settlement, the reduction in AOCI is offset by an increase in natural gas, NGLs and oil sales. For realized losses upon derivative contract settlement, the increase in AOCI is offset by a decrease in natural gas, NGLs and oil sales.

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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- Definition

Net of tax amount, before reclassification adjustments, of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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+ Details

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating activities:
Net (loss) income	$ (39,960)	$ 61,015
Adjustments to reconcile net (loss) income to net cash provided from operating activities:
Income from discontinued operations		(15,484)
Loss from equity method investments, net of distributions	2,252	18,777
Deferred income tax (benefit) expense	(17,910)	35,345
Depletion, depreciation and amortization and impairment	333,293	282,810
Exploration dry hole costs	832	2,516
Mark-to-market on natural gas, NGLs and oil derivatives not designated as hedges	(30,076)	(67,093)
Abandonment and impairment of unproved properties	104,048	52,064
Unrealized derivative loss (gain)	5,061	(2,531)
Allowance for bad debts		446
Amortization of deferred financing costs, loss on extinguishment of debt and other	5,970	23,753
Deferred and stock-based compensation	58,573	66,759
Loss on the sale of assets	12,704	1,280
Changes in working capital:
Accounts receivable	(9,479)	(34,356)
Inventory and other	(5,394)	875
Accounts payable	11,074	(7,262)
Accrued liabilities and other	30,135	9,953
Net cash provided from continuing operations	461,123	428,867
Net cash provided from discontinued operations		19,478
Net cash provided from operating activities	461,123	448,345
Investing activities:
Additions to natural gas and oil properties	(1,151,167)	(859,785)
Additions to field service assets	(3,056)	(5,915)
Acreage purchases	(175,041)	(151,118)
Proceeds from disposal of assets	32,082	40,264
Purchase of marketable securities held by the deferred compensation plan	(33,997)	(15,626)
Proceeds from the sales of marketable securities held by the deferred compensation plan	21,485	8,452
Net cash used in investing activities from continuing operations	(1,309,694)	(983,728)
Net cash provided from investing activities from discontinued operations		840,723
Net cash used in investing activities	(1,309,694)	(143,005)
Financing activities:
Borrowing on credit facilities	1,139,000	490,826
Repayment on credit facilities	(865,000)	(764,826)
Issuance of subordinated notes	600,000	500,000
Repayment of subordinated notes		(413,698)
Dividends paid	(19,475)	(19,305)
Debt issuance costs	(12,606)	(22,003)
Issuance of common stock	2,073	585
Change in cash overdrafts	(15,750)	(39,761)
Proceeds from the sales of common stock held by the deferred compensation plan	20,388	11,878
Net cash provided from (used in) financing activities	848,630	(256,304)
Increase in cash and cash equivalents	59	49,036
Cash and cash equivalents at beginning of period	92	2,848
Cash and cash equivalents at end of period	$ 151	$ 51,884

SUMMARY OF ORGANIZATION AND NATURE OF BUSINESS

9 Months Ended

Sep. 30, 2012

SUMMARY OF ORGANIZATION AND NATURE OF BUSINESS

(1)

SUMMARY OF ORGANIZATION AND NATURE OF BUSINESS

Range Resources Corporation (“Range,” “we,” “us,” or “our”) is a Fort Worth, Texas-based independent natural gas, natural gas liquids (“NGLs”) and oil company primarily engaged in the exploration, development and acquisition of natural gas and oil properties in the Appalachian and Southwestern regions of the United States. Our objective is to build stockholder value through consistent growth in reserves and production on a cost-efficient basis. Range is a Delaware corporation with our common stock listed and traded on the New York Stock Exchange under the symbol “RRC.”

BASIS OF PRESENTATION

9 Months Ended

Sep. 30, 2012

BASIS OF PRESENTATION

(2)

BASIS OF PRESENTATION

Presentation

These interim financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Range Resources Corporation 2011 Annual Report on Form 10-K filed on February 22, 2012, as amended by the Form 10-K/A filed on February 23, 2012. The results of operations for the quarter and the nine months ended September 30, 2012 are not necessarily indicative of the results to be expected for the full year. These consolidated financial statements are unaudited but, in the opinion of management, reflect all adjustments necessary for fair presentation of the results for the periods presented. All adjustments are of a normal recurring nature unless otherwise disclosed. These consolidated financial statements, including selected notes, have been prepared in accordance with the applicable rules of the Securities and Exchange Commission (“SEC”) and do not include all of the information and disclosures required by accounting principles generally accepted in the United States of America (“U.S. GAAP”) for complete financial statements. Certain reclassifications have been made to prior year’s reported amounts in order to conform with the current year presentation. These reclassifications include third party transportation and gathering costs which were previously reflected as a component of natural gas, NGL and oil sales and are currently reported as a separate operating expense. These reclassifications have no impact on previously reported net income.

In first quarter 2012, the Pennsylvania legislature passed an “impact fee” on unconventional natural gas and oil production. The impact fee is a per well annual fee imposed for a period of fifteen years on all unconventional wells drilled in Pennsylvania. The fee is based on the average annual price of natural gas and the Consumer Price Index. The annual fee per well declines each year over the fifteen year time period as long as the well is producing. We have recorded in the first nine months 2012, a retroactive impact fee of $24.7 million for wells drilled during 2011 and prior. This expense is reflected in our statement of operations category production and ad valorem taxes. In second quarter 2012, we also recorded a $23.1 million abandonment and impairment expense related to a transaction involving individually significant unproved leases in two Pennsylvania counties where we do not expect to drill. In third quarter 2012, we recorded a $19.6 million abandonment and impairment expense related to individually significant unproved leases in the North Texas Barnett Shale where we also do not expect to drill.

Discontinued Operations

In February 2011, we entered into an agreement to sell substantially all of our Barnett Shale assets. In April 2011, we completed the sale of most of these assets and closed the remainder of the sale in August 2011. We have classified the historical results of these operations as discontinued operations, net of tax, in the accompanying consolidated statements of operations. See Notes 4 and 5 for more information regarding the sale of our Barnett Shale assets. Unless otherwise indicated, the information in these notes to the consolidated financial statements relates to our continuing operations.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

NEW ACCOUNTING STANDARDS

9 Months Ended

Sep. 30, 2012

NEW ACCOUNTING STANDARDS

(3)

NEW ACCOUNTING STANDARDS

In May 2011, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2011-04, “Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRS.” This pronouncement was issued to provide a consistent definition of fair value and ensure that the fair value measurement and disclosure requirements are similar between U.S. GAAP and International Financial Reporting Standards. ASU 2011-04 changes certain fair value measurement principles and enhances the disclosure requirements, particularly for Level 3 fair value measurements. This pronouncement is effective for reporting periods beginning on or after December 15, 2011, with early adoption prohibited. The new guidance requires prospective application. We adopted this new requirement in first quarter 2012 and it did not have a material effect on our consolidated financial statements.

In December 2011, the FASB issued ASU No. 2011-11, “Disclosures about Offsetting Assets and Liabilities” requiring additional disclosures about offsetting and related arrangements. ASU 2011-11 is effective retrospectively for annual reporting periods beginning on or after January 1, 2013. The adoption of ASU 2011-11 is not expected to impact our future financial position, results of operation or liquidity.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6510796

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6801783&loc=d3e22583-107794

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
-URI http://asc.fasb.org/extlink&oid=6958853&loc=d3e46468-122699

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6801783&loc=d3e22580-107794

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6801783&loc=d3e22499-107794

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 01
-Paragraph b
-Subparagraph 6
-Article 10

+ Details

DISPOSITIONS

9 Months Ended

Sep. 30, 2012

DISPOSITIONS

(4)

DISPOSITIONS

2012 Dispositions

In September 2012, we sold unproved properties in three counties in Pennsylvania for proceeds of $13.9 million resulting in a pre-tax gain of $746,000. As part of this agreement, we retained an overriding royalty of 1% to 5% on a large portion of the leases. In June 2012, we sold a suspended exploratory well in the Marcellus Shale for proceeds of $2.5 million resulting in a pre-tax loss of $2.5 million. In March 2012, we sold seventy-five percent of a prospect in East Texas which included unproved properties and a suspended exploratory well to a third party for $8.6 million resulting in a pre-tax loss of $10.9 million. As part of this agreement, we retained a carried interest on the first well drilled and an overriding royalty of 2.5% to 5.0% in the prospect.

On October 9, 2012, we signed a definitive agreement to sell certain of our oil and gas properties in southern Oklahoma which includes approximately 45 producing wells for a purchase price of $135.0 million, subject to normal post-closing adjustments. The completion of the sale is dependent on prospective buyer due diligence procedures and there can be no assurance the sale will be completed or that there will not be changes to the sales price. We currently expect the closing date to be on November 19, 2012.

2011 Dispositions

In third quarter 2011, we sold various producing properties in East Texas for proceeds of $10.5 million. We recognized an impairment charge of $31.2 million in third quarter 2011 related to these properties. For more information on this impairment charge, see Note 13. Also in third quarter 2011, we sold producing properties in Pennsylvania for proceeds of $5.4 million, with no gain or loss recognized, as the sale did not materially impact the depletion rate of the remaining properties in the amortization base.

In February 2011, we entered into an agreement to sell substantially all of our Barnett Shale properties located in North Central Texas (Dallas, Denton, Ellis, Hill, Hood, Johnson, Parker, Tarrant and Wise Counties), which was subject to normal post-closing adjustments. We closed substantially all of this sale in April 2011 and closed the remainder in August 2011. The gross cash proceeds were approximately $889.3 million, including certain derivative contracts assumed by the buyer. The agreements had a February 1, 2011 effective date and consequently operating net revenues after January 2011 were a downward adjustment to the sales price. As indicated in Notes 2 and 5, the historic results of our Barnett Shale operations are presented as discontinued operations. In first quarter 2011, we also sold a low pressure pipeline for $14.7 million in proceeds, with no gain or loss recognized.

Also as part of the sale of our Barnett Shale properties, certain derivative contracts were assumed by the buyer. This resulted in a loss of $1.7 million in second quarter 2011, which is included in continuing operations. The hedges assumed as part of the sale were not designated to our Barnett production.

DISCONTINUED OPERATIONS

9 Months Ended

Sep. 30, 2012

DISCONTINUED OPERATIONS

(5)

DISCONTINUED OPERATIONS

The following table represents the components of our Barnett Shale operations as discontinued operations for the three months and the nine months ended September 30, 2011 (in thousands).


	Three Months Ended September 30, 2011			Nine Months Ended September 30, 2011
Revenues and other income:
Natural gas, NGLs and oil sales	$	1,673		$	58,997
Other		—			10
Gain on the sale of assets		1,032			4,852

Total revenues and other income		2,705			63,859


Costs and expenses:
Direct operating		(611	)		9,835
Transportation, gathering and compression		950			5,240
Production and ad valorem taxes		(44	)		1,206
Exploration expense		—			37
Interest expense ^(a)		—			14,791
Depletion, depreciation and amortization		—			8,894

Total costs and expenses		295			40,003


Income before income taxes		2,410			23,856

Income tax expense
Current		—			—
Deferred		841			8,372

		841			8,372


Net income from discontinued operations	$	1,569		$	15,484

^(a)	Interest expense is allocated to discontinued operations based on the ratio of net assets of discontinued operations to our consolidated net assets plus long-term debt.

The carrying values of our Barnett operations were included in discontinued operations in the accompanying consolidated balance sheets, which is comprised of the following (in thousands):


	December 31, 2011

Composition of liabilities of discontinued operations:
Accrued liabilities	$	653

Total current liabilities of discontinued operations	$	653

- Definition

The entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity (discontinued operations).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1510-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1474-107760

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1020-107759

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1012-107759

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 43-48
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

INCOME TAXES

9 Months Ended

Sep. 30, 2012

INCOME TAXES

(6)

INCOME TAXES

Income tax (benefit) expense from continuing operations was as follows (in thousands):


	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011

Income tax (benefit) expense	$	(29,074	)	$	22,540		$	(17,910	)	$	35,346
Effective tax rate		35.1	%		40.4	%		30.9	%		43.7	%

We compute our quarterly taxes under the effective tax rate method based on applying an anticipated annual effective rate to our year-to-date income, except for discrete items. Income taxes for discrete items are computed and recorded in the period that the specific transaction occurs. For third quarter and nine months ended September 30, 2012 and 2011, our overall effective tax rate on pre-tax income from continuing operations was different than the statutory rate of 35% due primarily to state income taxes, valuation allowances and other permanent differences.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

+ Details

INCOME (LOSS) PER COMMON SHARE

9 Months Ended

Sep. 30, 2012

INCOME (LOSS) PER COMMON SHARE

(7)

INCOME (LOSS) PER COMMON SHARE

Basic income or loss per share attributable to common shareholders is computed as (1) income or loss attributable to common shareholders (2) less income allocable to participating securities (3) divided by weighted average basic shares outstanding. Diluted income or loss per share attributable to common stockholders is computed as (1) basic income or loss attributable to common shareholders (2) plus diluted adjustments to income allocable to participating securities (3) divided by weighted average diluted shares outstanding. The following tables set forth a reconciliation of income or loss attributable to common shareholders to basic income or loss attributable to common shareholders and to diluted income or loss attributable to common shareholders (in thousands except per share amounts):


	Three Months Ended September 30, 2012								Three Months Ended September 30, 2011
	Continuing Operations			Discontinued Operations		Total			Continuing Operations			Discontinued Operations			Total

(Loss) income as reported	$	(53,836	)	$	—	$	(53,836	)	$	33,186		$	1,569		$	34,755
Participating basic earnings ^(a)		(119	)		—		(119	)		(585	)		(28	)		(613	)

Basic (loss) income attributed to common shareholders		(53,955	)		—		(53,955	)		32,601			1,541			34,142
Reallocation of participating earnings ^(a)		—			—		—			3			—			3

Diluted (loss) income attributed to common shareholders	$	(53,955	)	$	—	$	(53,955	)	$	32,604		$	1,541		$	34,145


(Loss) income per common share:
Basic	$	(0.34	)	$	—	$	(0.34	)	$	0.21		$	0.01		$	0.22
Diluted	$	(0.34	)	$	—	$	(0.34	)	$	0.20		$	0.01		$	0.21

^(a)

Restricted Stock Awards represent participating securities because they participate in nonforfeitable dividends or distributions with common equity owners. Income allocable to participating securities represents the distributed and undistributed earnings attributable to the participating securities. Participating securities, however, do not participate in undistributed net losses.


	Nine Months Ended September 30, 2012								Nine Months Ended September 30, 2011
	Continuing Operations			Discontinued Operations		Total			Continuing Operations			Discontinued Operations			Total

(Loss) income as reported	$	(39,960	)	$	—	$	(39,960	)	$	45,531		$	15,484		$	61,015
Participating basic earnings ^(a)		(348	)		—		(348	)		(818	)		(278	)		(1,096	)

Basic (loss) income attributed to common shareholders		(40,308	)		—		(40,308	)		44,713			15,206			59,919
Reallocation of participating earnings ^(a)		—			—		—			3			2			5

Diluted (loss) income attributed to common shareholders	$	(40,308	)	$	—	$	(40,308	)	$	44,716		$	15,208		$	59,924


(Loss) income per common share:
Basic	$	(0.25	)	$	—	$	(0.25	)	$	0.28		$	0.10		$	0.38
Diluted	$	(0.25	)	$	—	$	(0.25	)	$	0.28		$	0.10		$	0.38

^(a)

The following table provides a reconciliation of basic weighted average common shares outstanding to diluted weighted average common shares outstanding (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Denominator:
Weighted average common shares outstanding – basic		159,563		158,154		159,297		157,901
Effect of dilutive securities:
Director and employee stock options and SARs		—		1,168		—		1,038

Weighted average common shares outstanding – diluted		159,563		159,322		159,297		158,939

Weighted average common shares – basic for the three months ended September 30, 2012 excludes 3.0 million shares and the three months ended September 30, 2011 excludes 2.9 million shares of restricted stock held in our deferred compensation plans (although all awards are issued and outstanding upon grant). Weighted average common shares-basic for the nine months ended September 30, 2012 and 2011 excludes 2.9 million shares of restricted stock. Due to our loss from continuing operations for the three months and the nine months ended September 30, 2012, we excluded all outstanding stock options, stock appreciation rights (“SARs”) and restricted stock from the computations of diluted net income per share because the effect would have been anti-dilutive to the computations. SARs of 347,000 for the three months ended September 30, 2011 and 855,000 for the nine months ended September 30, 2011 were outstanding but not included in the computations of diluted income from continuing operations per share because the grant prices of the SARs were greater than the average market price of the common shares.

SUSPENDED EXPLORATORY WELL COSTS

9 Months Ended

Sep. 30, 2012

SUSPENDED EXPLORATORY WELL COSTS

(8)

SUSPENDED EXPLORATORY WELL COSTS

We capitalize exploratory well costs until a determination is made that the well has either found proved reserves or that it is impaired. Capitalized exploratory well costs are presented in natural gas and oil properties in the accompanying consolidated balance sheets. If an exploratory well is determined to be impaired, the well costs are charged to exploration expense in the accompanying consolidated statements of operations. The following table reflects the changes in capitalized exploratory well costs for the nine months ended September 30, 2012 and the year ended December 31, 2011 (in thousands except for number of projects):


	September 30,			December 31,
	2012			2011
Balance at beginning of period	$	93,388		$	23,908
Additions to capitalized exploratory well costs pending the determination of proved reserves		186,087			86,996
Reclassifications to wells, facilities and equipment based on determination of proved reserves		(178,422	)		(17,516	)
Divested wells		(4,980	)		—

Balance at end of period		96,073			93,388
Less exploratory well costs that have been capitalized for a period of one year or less		(74,269	)		(83,860	)

Capitalized exploratory well costs that have been capitalized for a period greater than one year	$	21,804		$	9,528


Number of projects that have exploratory well costs that have been capitalized for a period greater than one year		8			3

As of September 30, 2012, $21.8 million of capitalized exploratory well costs have been capitalized for more than one year with five of the wells waiting on pipelines and three of the wells currently in the completion stage. Seven of the wells are located in our Marcellus Shale area. In second quarter 2012, we sold a Marcellus Shale exploratory well. In first quarter 2012, we sold a seventy-five percent interest in an East Texas exploratory well. For additional information, see Note 4. The following table provides an aging of capitalized exploratory well costs that have been suspended for more than one year as of September 30, 2012 (in thousands):


	Total		2012		2011		2010		2009		2008

Capitalized exploratory well costs that have been capitalized for more than one year	$	21,804	$	7,019	$	10,306	$	72	$	2,884	$	1,523

INDEBTEDNESS

9 Months Ended

Sep. 30, 2012

INDEBTEDNESS

(9)

INDEBTEDNESS

We had the following debt outstanding as of the dates shown below (in thousands) (bank debt interest rate at September 30, 2012 is shown parenthetically). No interest was capitalized during the three months or the nine months ended September 30, 2012 or 2011.


	September 30,		December 31,
	2012		2011

Bank debt (1.8%)	$	461,000	$	187,000

Senior subordinated notes:
7.50% senior subordinated notes due 2017		250,000		250,000
7.25% senior subordinated notes due 2018		250,000		250,000
8.00% senior subordinated notes due 2019, net of $11,131 and $12,033 discount, respectively		288,869		287,967
6.75% senior subordinated notes due 2020		500,000		500,000
5.75% senior subordinated notes due 2021		500,000		500,000
5.00% senior subordinated notes due 2022		600,000		—

Total debt	$	2,849,869	$	1,974,967

Bank Debt

In February 2011, we entered into an amended and restated revolving bank facility, which we refer to as our bank debt or our bank credit facility, which is secured by substantially all of our assets. The bank credit facility provides for an initial commitment equal to the lesser of the facility amount or the borrowing base. On September 30, 2012, the facility amount was $1.75 billion and the borrowing base was $2.0 billion. The bank credit facility provides for a borrowing base subject to redeterminations semi-annually and for event-driven unscheduled redeterminations. As part of our semi-annual bank review completed on October 4, 2012, our borrowing base was reaffirmed at $2.0 billion and our facility amount was also reaffirmed at $1.75 billion. Our current bank group is comprised of twenty-eight financial institutions, with no one bank holding more than 9% of the total facility and includes three additional banks that were added in April 2012. The facility amount may be increased to the borrowing base amount with twenty days notice, subject to the banks agreeing to participate in the facility increase and payment of a mutually acceptable commitment fee to those banks. As of September 30, 2012, the outstanding balance under our bank credit facility was $461.0 million. Additionally, we had $62.1 million of undrawn letters of credit leaving $1.2 billion of borrowing capacity available under the facility amount. The facility matures on February 18, 2016. Borrowings under the bank facility can either be at the Alternate Base Rate (as defined) plus a spread ranging from 0.50% to 1.5% or LIBOR borrowings at the Adjusted LIBO Rate (as defined) plus a spread ranging from 1.5% to 2.5%. The applicable spread is dependent upon borrowings relative to the borrowing base. We may elect, from time to time, to convert all or any part of our LIBOR loans to base rate loans or to convert all or any of the base rate loans to LIBOR loans. The weighted average interest rate was 2.1% for the three months ended September 30, 2012. The weighted average interest rate was 2.2% for the nine months ended September 30, 2012 compared to 2.2% for the nine months ended September 30, 2011. A commitment fee is paid on the undrawn balance based on an annual rate of 0.375% to 0.50%. At September 30, 2012, the commitment fee was 0.375% and the interest rate margin was 1.5% on our LIBOR loans and 0.5% on our base rate loans.

Senior Subordinated Notes

In March 2012, we issued $600.0 million aggregate principal amount of 5.00% senior subordinated notes due 2022 (“5.00% Notes”) for net proceeds of $589.5 million after underwriting discounts and commissions of $10.5 million. The 5.00% Notes were issued at par. Interest on the 5.00% Notes is payable semi-annually in February and August and is guaranteed by all of our subsidiary guarantors. We may redeem the 5.00% Notes, in whole or in part, at any time on or after February 15, 2017, at a redemption price of 102.5% of the principal amount as of February 15, 2017, declining to 100% on February 15, 2020 and thereafter. Before February 2015, we may redeem up to 35% of the original aggregate principal amount of the 5.00% Notes at a redemption price equal to 105% of the principal amount thereof, plus accrued and unpaid interest, if any, with the proceeds of certain equity offerings, provided that 65% of the aggregate principal amount of 5.00% Notes remains outstanding immediately after the occurrence of such redemption and also provided such redemption shall occur within 60 days of the date of the closing of the equity offering. On closing of the 5.00% Notes, we used $350.0 million of the proceeds to pay down our outstanding credit facility balance.

If we experience a change of control, bondholders may require us to repurchase all or a portion of all of our senior subordinated notes at 101% of the aggregate principal amount plus accrued and unpaid interest, if any. All of the senior subordinated notes and the guarantees by our subsidiary guarantors are general, unsecured obligations and are subordinated to our bank debt and will be subordinated to future senior debt that we or our subsidiary guarantors are permitted to incur under the bank credit facility and the indentures governing the subordinated notes.

Guarantees

Range Resources Corporation is a holding company which owns no operating assets and has no significant operations independent of its subsidiaries. The guarantees by our subsidiaries of our senior subordinated notes are full and unconditional and joint and several.

Debt Covenants and Maturity

Our bank credit facility contains negative covenants that limit our ability, among other things, to pay cash dividends, incur additional indebtedness, sell assets, enter into certain hedging contracts, change the nature of our business or operations, merge, consolidate, or make investments. In addition, we are required to maintain a ratio of debt to EBITDAX (as defined in the credit agreement) of no greater than 4.25 to 1.0 and a current ratio (as defined in the credit agreement) of no less than 1.0 to 1.0. We were in compliance with our covenants under the bank credit facility at September 30, 2012.

The indentures governing our senior subordinated notes contain various restrictive covenants that are substantially identical to each other and may limit our ability to, among other things, pay cash dividends, incur additional indebtedness, sell assets, enter into transactions with affiliates, or change the nature of our business. At September 30, 2012, we were in compliance with these covenants.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

ASSET RETIREMENT OBLIGATIONS

9 Months Ended

Sep. 30, 2012

ASSET RETIREMENT OBLIGATIONS

(10)

ASSET RETIREMENT OBLIGATIONS

Our asset retirement obligations primarily represent the estimated present value of the amounts we will incur to plug, abandon and remediate our producing properties at the end of their productive lives. Significant inputs used in determining such obligations include estimates of plugging and abandonment costs, estimated future inflation rates and well life. The inputs are calculated based on historical data as well as current estimated costs. A reconciliation of our liability for plugging and abandonment costs for the first nine months 2012 is as follows (in thousands):


	Nine Months Ended September 30, 2012

Beginning of period	$	84,810
Liabilities incurred		7,400
Liabilities settled		(3,073	)
Disposition of wells		(1,286	)
Accretion expense		6,444
Change in estimate		22,295

End of period		116,590

Less current portion		(5,005	)


Long-term asset retirement obligations	$	111,585

Accretion expense is recognized as a component of depreciation, depletion and amortization expense in the accompanying statements of operations.

CAPITAL STOCK

9 Months Ended

Sep. 30, 2012

CAPITAL STOCK

(11)

CAPITAL STOCK

We have authorized capital stock of 485.0 million shares which includes 475.0 million shares of common stock and 10.0 million shares of preferred stock. We currently have no preferred stock issued or outstanding. The following is a schedule of changes in the number of common shares outstanding since the beginning of 2011:


	Nine Months Ended September 30,		Year Ended December 31,
	2012		2011

Beginning balance		161,131,547		159,909,052
Stock options/SARs exercised		878,963		862,774
Restricted stock granted		354,674		326,591
Restricted stock units vested		55,588		—
Treasury shares issued		40,268		33,130

Ending balance		162,461,040		161,131,547

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section B
-Paragraph 7, 11A
-Chapter 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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-Paragraph d
-Article 4

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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-Paragraph 29, 30, 31
-Article 5

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 21: http://www.xbrl.org/2003/role/presentationRef
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-Name Staff Accounting Bulletin (SAB)
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Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

DERIVATIVE ACTIVITIES

9 Months Ended

Sep. 30, 2012

DERIVATIVE ACTIVITIES

(12)

DERIVATIVE ACTIVITIES

We use commodity-based derivative contracts to manage exposure to commodity price fluctuations. We do not enter into these arrangements for speculative or trading purposes. We do not utilize complex derivatives as we typically utilize commodity swap, collar, call or put option contracts to (1) reduce the effect of price volatility of the commodities we produce and sell and (2) support our annual capital budget and expenditure plans. In 2011, we sold NGLs derivative swap contracts (“sold swaps”) for the natural gasoline (or C5) component of natural gas liquids and in 2012, we also entered into purchased derivative swaps (“purchased swaps”) for C5 volumes. These purchased swaps were, in some cases, with the same counterparties as our sold swaps. We entered into these purchased swaps to lock in certain natural gasoline derivative gains. In second quarter 2012, we also entered into NGL derivative swap contracts for the propane (or C3) component of NGLs. At September 30, 2012, we had open swap contracts covering 89.6 Bcf of natural gas at prices averaging $3.62 per mcf, 3.3 million barrels of oil at prices averaging $95.70 per barrel, 3.0 million net barrels of NGLs (the C5 component of NGLs) at prices averaging $95.80 per barrel and 2.4 million barrels of NGLs (the C3 component of NGLs) at prices averaging $36.27 per barrel. At September 30, 2012, we had collars covering 232.0 Bcf of natural gas at weighted average floor and cap prices of $4.23 to $4.83 per mcf and 2.0 million barrels of oil at weighted average floor and cap prices of $86.88 to $98.17 per barrel. At September 30, 2012, we also had sold call options for 0.4 million barrels of oil at a weighted average price of $85.00 per barrel and purchased put options for 0.2 million barrels of oil at a weighted average price of $80.00 per barrel. The fair value of these contracts, represented by the estimated amount that would be realized upon termination, based on a comparison of the contract price and a reference price, generally the New York Mercantile Exchange (“NYMEX”), approximated a net unrealized pre-tax gain of $139.3 million at September 30, 2012. These contracts expire monthly through December 2014. The following table sets forth our derivative volumes by year as of September 30, 2012.


Period	Contract Type	Volume Hedged	Weighted Average Hedge Price

Natural Gas
2012	Collars	279,641 Mmbtu/day	$ 4.76–$ 5.22
2013	Collars	240,000 Mmbtu/day	$ 4.73–$ 5.20
2014	Collars	325,000 Mmbtu/day	$ 3.75–$ 4.47
2012	Swaps	270,000 Mmbtu/day	$3.77
2013	Swaps	177,521 Mmbtu/day	$3.57

Crude Oil
2012	Collars	2,000 bbls/day	$ 70.00–$ 80.00
2013	Collars	3,000 bbls/day	$ 90.60–$ 100.00
2014	Collars	2,000 bbls/day	$ 85.55–$ 100.00
2012	Call Options	4,700 bbls/day	$85.00
2012	Put Options	2,500 bbls/day	$80.00
2013	Swaps	5,081 bbls/day	$96.59
2014	Swaps	4,000 bbls/day	$94.56

NGLs (Natural Gasoline)
2012	Sold Swaps	12,000 bbls/day	$96.28
2013	Sold Swaps	8,000 bbls/day	$89.64
2012	Purchased Swaps	5,500 bbls/day	$82.37
2013	Purchased Swaps	1,500 bbls/day	$76.30

NGLs (Propane)
2012	Swaps	6,000 bbls/day	$38.67
2013	Swaps	5,000 bbls/day	$35.55

Every derivative instrument is required to be recorded on the balance sheet as either an asset or a liability measured at its fair value. Fair value is determined based on the difference between the fixed contract price and the underlying market price at the determination date. Changes in the fair value of our derivatives that qualify for hedge accounting are recorded as a component of accumulated other comprehensive income (“AOCI”) in the stockholders’ equity section of the accompanying consolidated balance sheets, which is later transferred to natural gas, NGLs and oil sales when the underlying physical transaction occurs and the hedging contract is settled. As of September 30, 2012, an unrealized pre-tax derivative gain of $110.3 million was recorded in AOCI. This gain will be reclassified into earnings as a gain of $43.4 million in fourth quarter 2012, a gain of $71.8 million in 2013 and a loss of $4.9 million in 2014 as the contracts settle. The actual reclassification to earnings will be based on market prices at the contract settlement date. If the derivative does not qualify as a hedge or is not designated as a hedge, changes in fair value of these non-hedge derivatives are recognized in earnings in derivative fair value income (loss).

For those derivative instruments that qualify for hedge accounting, settled transaction gains and losses are determined monthly, and are included as increases or decreases to natural gas, NGLs and oil sales in the period the hedged production is sold. Through September 2012, we have elected to designate our commodity derivative instruments that qualify for hedge accounting as cash flow hedges. Natural gas, NGLs and oil sales include $61.5 million of gains in third quarter 2012 compared to gains of $26.8 million in the same period of 2011 related to settled hedging transactions. Natural gas, NGLs and oil sales include $197.7 million of gains in the first nine months 2012 compared to $80.7 million in the same period of 2011. Any ineffectiveness associated with these hedge derivatives are reflected in derivative fair value income (loss) in the accompanying statements of operations. The ineffective portion is generally calculated as the difference between the changes in fair value of the derivative and the estimated change in future cash flows from the item hedged. Derivative fair value income (loss) for the three months ended September 30, 2012 includes ineffective losses (unrealized and realized) of $3.7 million compared to a loss of $1.9 million in the three months ended September 30, 2011. Derivative fair value income (loss) for the nine months ended September 30, 2012 includes ineffective losses (unrealized and realized) of $1.6 million compared to gains of $7.1 million in the same period of 2011.

Derivative fair value (loss) income

The following table presents information about the components of derivative fair value (loss) income for the three months and the nine months ended September 30, 2012 and 2011 (in thousands):


	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011

Change in fair value of derivatives that do not qualify for hedge accounting ^(a)	$	(53,646	)	$	58,990		$	30,075		$	67,093
Realized gain (loss) on settlement – natural gas ^(a) ^(b)		—			5,334			—			8,424
Realized gain (loss) on settlement – oil ^(a) (b)		1,955			285			(1,899	)		(7,727	)
Realized gain (loss) on settlement – NGLs ^(a) (b)		14,682			3,087			20,442			3,087
Hedge ineffectiveness – realized		988			2,036			3,451			4,558
– unrealized		(4,707	)		(3,971	)		(5,061	)		2,531

Derivative fair value (loss) income	$	(40,728	)	$	65,761		$	47,008		$	77,966

^(a)	Derivatives that do not qualify for hedge accounting.

^(b)	These amounts represent the realized gains and losses on settled derivatives that do not qualify for hedge accounting, which before settlement are included in the category in this same table referred to as change in fair value of derivatives that do not qualify for hedge accounting.

Derivative assets and liabilities

The combined fair value of derivatives included in the accompanying consolidated balance sheets as of September 30, 2012 and December 31, 2011 is summarized below (in thousands). As of September 30, 2012, we are conducting derivative activities with sixteen financial institutions, of which all but two are secured lenders in our bank credit facility. We believe all of these institutions are acceptable credit risks. At times, such risks may be concentrated with certain counterparties. The credit worthiness of our counterparties is subject to periodic review. The assets and liabilities are netted where derivatives with both gain and loss positions are held by a single counterparty and we have master netting arrangements.


	September 30, 2012			December 31, 2011

Derivative assets:
Natural gas – swaps	$	(2,922	)	$	54,162
– collars		116,531			228,228
Crude oil – swaps		9,848			(263	)
– collars		(1,441	)		(16,607	)
– call options		(3,733	)		(29,348	)
– put options		46			—
NGLs – C5 swaps		33,864			15,328
– C3 swaps		296			—

	$	152,489		$	251,500

Derivative liabilities:
Natural gas – swaps	$	(2,764	)	$	—
– collars		(5,603	)		—
Crude oil – collars		141			—
– put options		31			—
NGLs – C5 swaps		2,378			(173	)
– C3 swaps		(7,416	)		—

	$	(13,233	)	$	(173	)

The table below provides data about the fair value of our derivative contracts (in thousands). Derivative assets and liabilities shown below are presented as gross assets and liabilities, without regard to master netting arrangements, which are considered in the presentation of derivative assets and liabilities in the accompanying consolidated balance sheets.


	September 30, 2012								December 31, 2011
	Assets		(Liabilities)						Assets		(Liabilities)
	Carrying Value		Carrying Value			Net Carrying Value			Carrying Value		Carrying Value			Net Carrying Value

Derivatives that qualify for cash flow hedge accounting :
Swaps ^(a)	$	24,344	$	(20,184	)	$	4,160		$	54,318	$	(419	)	$	53,899
Collars ^(a)		130,842		(18,816	)		112,026			228,228		(1,954	)		226,274
Put options ^(a)		77		—			77			—		—			—

	$	155,263	$	(39,000	)	$	116,263		$	282,546	$	(2,373	)	$	280,173


Derivatives that do not qualify for hedge accounting :
Sold swaps ^(a)	$	31,933	$	(7,594	)	$	24,339		$	17,949	$	(2,794	)	$	15,155
Purchased swaps ^(a)		5,571		(788	)		4,783			—		—			—
Collars ^(a)		—		(2,396	)		(2,396	)		—		(14,653	)		(14,653	)
Call options ^(a)		—		(3,733	)		(3,733	)		—		(29,348	)		(29,348	)

	$	37,504	$	(14,511	)	$	22,993		$	17,949	$	(46,795	)	$	(28,846	)

^(a)	Included in unrealized derivative gain or loss in the accompanying consolidated balance sheets.

The effects of our cash flow hedges (or those derivatives that qualify for hedge accounting) on accumulated other comprehensive income in the accompanying consolidated balance sheets is summarized below (in thousands):


	Three Months Ended September 30,												Nine Months Ended September 30,
	Change in Hedge Derivative Fair Value						Realized Gain (Loss) Reclassified from OCI into Revenue (a)						Change in Hedge Derivative Fair Value						Realized Gain (Loss) Reclassified from OCI into Revenue (a)
	2012			2011			2012			2011			2012			2011			2012			2011

Swaps	$	(33,311	)	$	15,739		$	18,204		$	—		$	22,525		$	17,854		$	69,851		$	—
Put options		(994	)		—			(682	)		—			(1,908	)		—			(998	)		—
Collars		(51,344	)		75,449			43,945			26,758			32,704			97,873			128,823			80,660
Collars – discontinued operations		—			—			—			—			—			412			—			8,607
Income taxes		33,403			(34,195	)		(23,972	)		(10,034	)		(21,780	)		(41,609	)		(76,805	)		(33,476	)

	$	(52,246	)	$	56,993		$	37,495		$	16,724		$	31,541		$	74,530		$	120,871		$	55,791

^(a)	For realized gains upon derivative contract settlement, the reduction in AOCI is offset by an increase in natural gas, NGLs and oil sales. For realized losses upon derivative contract settlement, the increase in AOCI is offset by a decrease in natural gas, NGLs and oil sales.

The effects of our non-hedge derivatives (or those derivatives that do not qualify for hedge accounting) and the ineffective portion of our hedge derivatives on our consolidated statements of operations is summarized below (in thousands):


	Three Months Ended September 30,
	Gain (Loss) Recognized in Income (Non-hedge Derivatives)					Gain (Loss) Recognized in Income (Ineffective Portion)						Derivative Fair Value Income (Loss)
	2012			2011		2012			2011			2012			2011

Swaps	$	(45,998	)	$	26,219	$	(1,556	)	$	—		$	(47,554	)	$	26,219
Purchased swaps		12,822			—		—			—			12,822			—
Collars		(1,714	)		15,828		(2,163	)		(1,935	)		(3,877	)		13,893
Call options		(2,119	)		25,649		—			—			(2,119	)		25,649

Total	$	(37,009	)	$	67,696	$	(3,719	)	$	(1,935	)	$	(40,728	)	$	65,761


	Nine Months Ended September 30,
	Gain (Loss) Recognized in Income (Non-hedge Derivatives)					Gain (Loss) Recognized in Income (Ineffective Portion)					Derivative Fair Value Income (Loss)
	2012		2011			2012			2011		2012		2011

Swaps	$	30,330	$	39,968		$	(890	)	$	—	$	29,440	$	39,968
Purchased swaps		4,078		—			—			—		4,078		—
Collars		3,381		14,693			(720	)		7,089		2,661		21,782
Call options		10,829		16,259			—			—		10,829		16,259
Basis swaps		—		(43	)		—			—		—		(43	)

Total	$	48,618	$	70,877		$	(1,610	)	$	7,089	$	47,008	$	77,966

The United States Congress adopted comprehensive financial reform legislation that establishes federal oversight and regulation of the over-the-counter derivatives market and entities, such as Range, that participate in that market. The new regulation, known as the Dodd-Frank Wall Street Reform and Consumer Protection Act required the Commodities Futures Trading Commission (the “CFTC”) and the SEC to promulgate rules and regulations implementing the new legislation. In July 2012 certain definitions were adopted by the SEC and the CFTC and based on those definitions, we believe we will qualify for the end-user exception related to the clearing requirement for swaps but we will be required to adhere to new reporting requirements.

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
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+ Details

FAIR VALUE MEASUREMENTS

9 Months Ended

Sep. 30, 2012

FAIR VALUE MEASUREMENTS

(13)

FAIR VALUE MEASUREMENTS

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. There are three approaches for measuring the fair value of assets and liabilities: the market approach, the income approach and the cost approach, each of which includes multiple valuation techniques. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. The income approach uses valuation techniques to measure fair value by converting future amounts, such as cash flows or earnings, into a single present value amount using current market expectations about those future amounts. The cost approach is based on the amount that would currently be required to replace the service capacity of an asset. This is often referred to as current replacement cost. The cost approach assumes that the fair value would not exceed what it would cost a market participant to acquire or construct a substitute asset of comparable utility, adjusted for obsolescence.

The fair value accounting standards do not prescribe which valuation technique should be used when measuring fair value and does not prioritize among the techniques. These standards establish a fair value hierarchy that prioritizes the inputs used in applying the various valuation techniques. Inputs broadly refer to the assumptions that market participants use to make pricing decisions, including assumptions about risk. Level 1 inputs are given the highest priority in the fair value hierarchy while Level 3 inputs are given the lowest priority. The three levels of the fair value hierarchy are as follows:

•

Level 1 – Observable inputs that reflect unadjusted quoted prices for identical assets or liabilities in active markets as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis.

•

Level 2 – Observable market-based inputs or unobservable inputs that are corroborated by market data. These are inputs other than quoted prices in active markets included in Level 1, which are either directly or indirectly observable as of the reporting date.

•

Level 3 – Unobservable inputs that are not corroborated by market data and may be used with internally developed methodologies that result in management’s best estimate of fair value.

Valuation techniques that maximize the use of observable inputs are favored. Assets and liabilities are classified in their entirety based on the lowest priority level of input that is significant to the fair value measurement. The assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the placement of assets and liabilities within the levels of the fair value hierarchy.

Fair Values-Recurring

We use a market approach for our recurring fair value measurements and endeavor to use the best information available. Accordingly, valuation techniques that maximize the use of observable impacts are favored. The following tables present the fair value hierarchy table for assets and liabilities measured at fair value, on a recurring basis (in thousands):


	Fair Value Measurements at September 30, 2012 using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Total Carrying Value as of September 30, 2012

Trading securities held in the deferred compensation plans	$	67,429	$	—		$	—	$	67,429

Derivatives – swaps		—		33,282			—		33,282
– collars		—		109,629			—		109,629
– call options		—		(3,732	)		—		(3,732	)
– put options		—		77			—		77


	Fair Value Measurements at December 31, 2011 using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Total Carrying Value as of December 31, 2011

Trading securities held in the deferred compensation plans	$	50,237	$	—		$	—	$	50,237

Derivatives – swaps		—		69,054			—		69,054
– collars		—		211,621			—		211,621
– call options		—		(29,348	)		—		(29,348	)

Our trading securities in Level 1 are exchange-traded and measured at fair value with a market approach using end of period market values. Derivatives in Level 2 are measured at fair value with a market approach using third-party pricing services, which have been corroborated with data from active markets or broker quotes.

Our trading securities held in the deferred compensation plan are accounted for using the mark-to-market accounting method and are included in other assets in the accompanying consolidated balance sheets. We elected to adopt the fair value option to simplify our accounting for the investments in our deferred compensation plan. Interest, dividends, and mark-to-market gains or losses are included in deferred compensation plan expense in the accompanying statement of operations. For third quarter 2012, interest and dividends were $122,000 and the mark-to-market adjustment was a gain of $3.8 million. For third quarter 2011, interest and dividends were $84,000 and the mark-to-market adjustment was a loss of $7.9 million. For the nine months ended September 30, 2012, interest and dividends were $279,000 and the mark-to-market adjustment was a gain of $5.7 million. For the nine months ended September 30, 2011, interest and dividends were $179,000 and the mark-to-market adjustment was a loss of $6.6 million.

Fair Values-Nonrecurring

We review our long-lived assets to be held and used, including proved natural gas and oil properties, whenever events or circumstances indicate the carrying value of those assets may not be recoverable. In third quarter 2012, we evaluated certain surface property we own which included a consideration for the potential sale of these assets. As a result, we recognized an impairment charge of $1.3 million.

Several long-lived assets held for use were evaluated for impairment during 2011 due to reductions in estimated reserves and lower natural gas prices. The fair value of our onshore Gulf Coast assets in 2011 was measured using an income approach based upon internal estimates of future production levels, prices, drilling and operating costs and discount rates, which are Level 3 inputs. Our projected undiscounted cash flows associated with these assets was less than their carrying value and therefore, we recorded an impairment of $7.5 million in third quarter 2011 related to our onshore Gulf Coast proved properties.

Also during third quarter 2011, we evaluated our East Texas properties for impairment which included a consideration for the potential sale of some of these assets, along with a reduction in estimated reserves and lower natural gas prices. This analysis reflected undiscounted cash flows for these properties was less than their carrying value and we recognized an impairment charge of $31.2 million. Some of these properties were sold in third quarter 2011 for proceeds of $10.5 million.

The following table presents the value of these assets measured at fair value on a nonrecurring basis (in thousands). All such fair value measurements represent Level 3 measurements.


	Three Months Ended September 30,								Nine Months Ended September 30,
	2012				2011				2012				2011
	Fair Value		Impairment		Fair Value		Impairment		Fair Value		Impairment		Fair Value		Impairment

Surface property	$	6,269	$	1,281	$	—	$	—	$	6,269	$	1,281	$	—	$	—
Natural gas and oil properties	$	—	$	—	$	24,388	$	38,681	$	—	$	—	$	24,388	$	38,681

Fair Values – Reported

The following table presents the carrying amounts and the fair values of our financial instruments as of September 30, 2012 and December 31, 2011 (in thousands):


	September 30, 2012						December 31, 2011
	Carrying Value			Fair Value			Carrying Value			Fair Value
Assets:
Commodity swaps, collars, call and put options	$	152,489		$	152,489		$	251,500		$	251,500
Marketable securities^(a)		67,429			67,429			50,237			50,237

Liabilities:
Commodity swaps, collars, call and put options		(13,233	)		(13,233	)		(173	)		(173	)
Bank credit facility^(b)		(461,000	)		(461,000	)		(187,000	)		(187,000	)
7.50% senior subordinated notes due 2017^(b)		(250,000	)		(260,000	)		(250,000	)		(265,625	)
7.25% senior subordinated notes due 2018^(b)		(250,000	)		(264,375	)		(250,000	)		(267,500	)
8.00% senior subordinated notes due 2019^(b)		(288,869	)		(333,000	)		(287,967	)		(334,500	)
6.75% senior subordinated notes due 2020^(b)		(500,000	)		(550,000	)		(500,000	)		(555,000	)
5.75% senior subordinated notes due 2021^(b)		(500,000	)		(537,500	)		(500,000	)		(541,250	)
5.00% senior subordinated notes due 2022^(b)		(600,000	)		(633,000	)		—			—

^(a)	Marketable securities, which are held in our deferred compensation plans, and are actively traded on major exchanges.

^(b)	The book value of our bank debt approximates fair value because of its floating rate structure. The fair value of our senior subordinated notes is based on end of period market quotes which are Level 2 market values.

Our current assets and liabilities contain financial instruments, the most significant of which are trade accounts receivables and payables. We believe the carrying values of our current assets and liabilities approximate fair value. Our fair value assessment incorporates a variety of considerations, including (1) the short-term duration of the instruments and (2) our historical incurrence of and expected future insignificance of bad debt expense.

Concentrations of Credit Risk

As of September 30, 2012, our primary concentrations of credit risk are the risks of collecting accounts receivable and the risk of counterparties’ failure to perform under derivative obligations. Most of our receivables are from a diverse group of companies, including major energy companies, pipeline companies, local distribution companies, financial institutions and end-users in various industries. Letters of credit or other appropriate security are obtained as necessary to limit our risk of loss. Our allowance for uncollectible receivables was $1.6 million at September 30, 2012 compared to $4.0 million at December 31, 2011. As of September 30, 2012, our derivative contracts consist of swaps, collars, call options and put options. Our exposure is diversified primarily among major investment grade financial institutions, the majority of which we have master netting agreements which provide for offsetting payables against receivables from separate derivative contracts. To manage counterparty risk associated with our derivatives, we select and monitor our counterparties based on our assessment of their financial strength and/or credit ratings. We may also limit the level of exposure with any single counterparty. At September 30, 2012 our derivative counterparties include sixteen financial institutions, of which all but two are secured lenders in our bank credit facility. At September 30, 2012, our net derivative assets include a receivable from the two counterparties not included in our bank credit facility of $12.7 million. For those counterparties that are not secured lenders in our bank credit facility or for which we do not have master netting arrangements, net derivative asset values are determined, in part, by reviewing credit default swap spreads for the counterparties. Net derivative liabilities are determined, in part, by using our market-based credit spread. None of our derivative contracts have margin requirements or collateral provisions that would require funding prior to the scheduled cash settlement date. We have also entered into the International Swaps and Derivatives Association Master Agreements (“ISDA Agreements”) with our counterparties. The terms of the ISDA Agreements provide us and our counterparties with rights of set off upon the occurrence of defined acts of default by either us or a counterparty to a derivative, whereby the party not in default may set off all derivative liabilities owed to the defaulting party against all derivative asset receivables from the defaulting party.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

STOCK-BASED COMPENSATION PLANS

9 Months Ended

Sep. 30, 2012

STOCK-BASED COMPENSATION PLANS

(14)

STOCK-BASED COMPENSATION PLANS

Stock-Based Awards

Stock options represent the right to purchase shares of stock in the future at the fair value of the stock on the date of grant. Most stock options granted under our stock option plans vest over a three-year period and expire five years from the date they are granted. Beginning in 2005, we began granting SARs to reduce the dilutive impact of our equity plans. Similar to stock options, SARs represent the right to receive a payment equal to the excess of the fair market value of shares of common stock on the date the right is exercised over the value of the stock on the date of grant. All SARs granted under the 2005 Plan will be settled in shares of stock, vest over a three-year period and have a maximum term of five years from the date they are granted. Beginning in first quarter 2011, the Compensation Committee also began granting restricted stock units under our equity-based stock compensation plans. These restricted stock units, which we refer to as restricted stock Equity Awards, vest over a three-year period. All awards granted have been issued at prevailing market prices at the time of grant and the vesting of these shares is based upon an employee’s continued employment with us.

The Compensation Committee also grants restricted stock to certain employees and non-employee directors of the Board of Directors as part of their compensation. Compensation expense is recognized over the balance of the vesting period, which is typically three years for employee grants and immediate vesting for non-employee directors. All restricted stock awards are issued at prevailing market prices at the time of the grant and vesting is based upon an employee’s continued employment with us. Prior to vesting, all restricted stock awards have the right to vote such stock and receive dividends thereon. Upon grant of these restricted shares, which we refer to as restricted stock Liability Awards, the shares are placed in our deferred compensation plan and, upon vesting, employees are allowed to take withdrawals either in cash or in stock. These Liability Awards are classified as a liability and are remeasured at fair value each reporting period. This mark-to-market adjustment is reported in deferred compensation plan expense in the accompanying consolidated statements of operations.

Total Stock-Based Compensation Expense

Stock-based compensation represents amortization of restricted stock grants and SARs expense. In third quarter 2012, stock-based compensation was allocated to operating expense ($598,000), exploration expense ($1.1 million) and general and administrative expense ($10.1 million) for a total expense of $12.2 million. In third quarter 2011, stock-based compensation was allocated to operating expense ($463,000), exploration expense ($902,000) and general and administrative expense ($8.5 million) for a total expense of $10.2 million. In the first nine months 2012, stock-based compensation was allocated to operating expense ($1.6 million), exploration expense ($3.0 million) and general and administrative expense ($30.8 million) for a total expense of $36.8 million. In the first nine months 2011, stock-based compensation was allocated to operating expense ($1.4 million), exploration expense ($3.2 million) and general and administrative expense ($27.5 million) for a total expense of $33.2 million. Unlike the other forms of stock-based compensation mentioned above, the mark-to-market adjustment of the liability related to the vested restricted stock held in our deferred compensation plans is directly tied to the change in our stock price and not directly related to the functional expenses and therefore, is not allocated to the functional categories.

Stock and Option Plans

We have two active equity-based stock plans, the 2005 Plan and the Director Plan. Under these plans, incentive and non-qualified stock options, SARs, restricted stock units and various other awards may be issued to directors and employees pursuant to decisions of the Compensation Committee, which is made up of non-employee, independent directors from the Board of Directors. All awards granted under these plans have been issued at prevailing market prices at the time of the grant. Of the 3.6 million grants outstanding at September 30, 2012, 32,450 of the grants relate to stock options with the remainder of 3.6 million grants relating to SARs. Information with respect to stock option and SARs activities is summarized below.


	Shares			Weighted Average Exercise Price

Outstanding at December 31, 2011		4,558,609		$	41.47
Granted		754,471			64.14
Exercised		(1,697,091	)		28.61
Expired/forfeited		(12,419	)		48.06

Outstanding at September 30, 2012		3,603,570		$	52.25

Stock Appreciation Right Awards

During first nine months 2012, we granted SARs to officers and non-officer employees. The weighted average grant date fair value of these SARs, based on our Black-Scholes-Merton assumptions, is shown below:


	Nine Months Ended September 30, 2012

Weighted average exercise price per share	$	64.14
Expected annual dividends per share		0.25	%
Expected life in years		3.7
Expected volatility		45	%
Risk-free interest rate		0.5	%
Weighted average grant date fair value	$	21.32

Restricted Stock Awards

Equity Awards

In the first nine months 2012, we granted 360,000 restricted stock Equity Awards to employees at an average grant price of $63.37 compared to 329,000 granted to employees at an average grant price of $49.47 in the same period of 2011. These awards generally vest over a three-year period. We recorded compensation expense for these awards of $8.2 million in the first nine months 2012 compared to $2.9 million in the same period of 2011. Equity Awards are not issued to employees until they are vested. Employees do not have the option to receive cash.

Liability Awards

In first nine months 2012, we granted 356,000 shares of restricted stock Liability Awards as compensation to employees at an average price of $63.88 with vesting generally over a three-year period and 14,700 were granted to directors at an average price of $64.35 with immediate vesting. In the same period of 2011, we granted 334,200 shares of Liability Awards as compensation to employees at an average price of $51.11 with vesting generally over a three-year period and 15,500 shares were granted to directors at an average price of $52.35 with immediate vesting. We recorded compensation expense for Liability Awards of $15.2 million in the first nine months 2012 compared to $14.6 million in the same period of 2011. Substantially all of these awards are held in our deferred compensation plan, are classified as a liability and are remeasured at fair value each reporting period. This mark-to-market adjustment is reported in the deferred compensation expense in our consolidated statements of operations (see additional discussion below).

A summary of the status of our non-vested restricted stock outstanding at September 30, 2012 is summarized below:


	Equity Awards					Liability Awards
	Shares			Weighted Average Grant Date Fair Value		Shares			Weighted Average Grant Date Fair Value

Outstanding at December 31, 2011		221,609		$	49.64		487,244		$	48.76
Granted		359,732			63.37		370,385			63.90
Vested		(140,818	)		56.83		(324,433	)		51.30
Forfeited		(23,782	)		58.37		(2,093	)		50.50

Outstanding at September 30, 2012		416,741		$	58.56		531,103		$	57.76

Deferred Compensation Plan

Our deferred compensation plan gives directors, officers and key employees the ability to defer all or a portion of their salaries and bonuses and invest in Range common stock or make other investments at the individual’s discretion. Range provides a partial matching contribution which vests over three years. The assets of the plans are held in a grantor trust, which we refer to as the Rabbi Trust, and are therefore available to satisfy the claims of our creditors in the event of bankruptcy or insolvency. Our stock held in the Rabbi Trust is treated as a liability award as employees are allowed to take withdrawals from the Rabbi Trust either in cash or in Range stock. The liability for the vested portion of the stock held in the Rabbi Trust is reflected in the deferred compensation liability in the accompanying consolidated balance sheets and is adjusted to fair value each reporting period by a charge or credit to deferred compensation plan expense on our consolidated statements of operations. The assets of the Rabbi Trust, other than our common stock, are invested in marketable securities and reported at their market value in other assets in the accompanying consolidated balance sheets. The deferred compensation liability reflects the vested market value of the marketable securities and Range stock held in the Rabbi Trust. Changes in the market value of the marketable securities and changes in the fair value of the deferred compensation plan liability are charged or credited to deferred compensation plan expense each quarter. We recorded mark-to-market loss of $20.1 million in third quarter 2012 compared to mark-to-market loss of $8.7 million in third quarter 2011. We recorded mark-to-market loss of $21.6 million in the first nine months 2012 compared to mark-to-market loss of $33.6 million in the same period of 2011. The Rabbi Trust held 2.8 million shares (2.3 million of vested shares) of Range stock at September 30, 2012 compared to 2.8 million shares (2.3 million of vested shares) at December 31, 2011.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

SUPPLEMENTAL CASH FLOW INFORMATION

9 Months Ended

Sep. 30, 2012

SUPPLEMENTAL CASH FLOW INFORMATION

(15)

SUPPLEMENTAL CASH FLOW INFORMATION


	Nine Months Ended September 30,
	2012		2011
	(in thousands)
Net cash provided from operating activities included:
Income taxes paid to taxing authorities	$	436	$	309
Interest paid		99,828		95,536

Non-cash investing and financing activities included:
Asset retirement costs capitalized, net		29,695		13,569

COMMITMENTS AND CONTINGENCIES

9 Months Ended

Sep. 30, 2012

COMMITMENTS AND CONTINGENCIES

(16)

COMMITMENTS AND CONTINGENCIES

Litigation

We are the subject of, or party to, a number of pending or threatened legal actions and claims arising in the ordinary course of our business. While many of these matters involve inherent uncertainty, we believe that the amount of the liability, if any, ultimately incurred with respect to proceedings or claims will not have a material adverse effect on our consolidated financial position as a whole or on our liquidity, capital resources or future annual results of operations. We will continue to evaluate our litigation on a quarter-by-quarter basis and will establish and adjust any litigation reserves as appropriate to reflect our assessment of the then current status of litigation.

Transportation and Gathering Contracts

As of September 30, 2012, future minimum firm transportation and gathering contracts are as follows (in thousands):


	Transportation and Gathering Contracts

2012 (remaining)	$	35,581
2013		145,981
2014		143,925
2015		153,468
2016		155,828
Thereafter		861,431

	$	1,496,214

Drilling Contracts

As of September 30, 2012, we have contracts with drilling contractors to use three drilling rigs with terms of up to four years with minimum future commitments of $5.9 million in fourth quarter 2012, $23.2 million in fiscal year 2013, $9.9 million in fiscal year 2014 and $2.2 million in fiscal year 2015. Early termination of these contracts at September 30, 2012 would require us to pay maximum penalties of $30.0 million. We do not expect to pay early termination penalties related to these contracts.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization

9 Months Ended

Sep. 30, 2012

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization

(17)

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization ^(a)


	September 30, 2012		December 31, 2011
	(in thousands)
Natural gas and oil properties:
Properties subject to depletion	$	7,219,474	$	6,035,429
Unproved properties		781,371		748,598

Total		8,000,845		6,784,027
Accumulated depreciation, depletion and amortization		(1,942,698)		(1,626,461)

Net capitalized costs	$	6,058,147	$	5,157,566

^(a)	Includes capitalized asset retirement costs and the associated accumulated amortization.

Costs Incurred for Property Acquisition, Exploration and Development

9 Months Ended

Sep. 30, 2012

Costs Incurred for Property Acquisition, Exploration and Development

(18)

Costs Incurred for Property Acquisition, Exploration and Development ^(a)


	Nine Months Ended September 30, 2012		Year Ended December 31, 2011
	(in thousands)
Acreage purchases	$	173,718	$	220,576
Development		855,650		1,007,049
Exploration:
Drilling		268,328		226,920
Expense		48,738		77,259
Stock-based compensation expense		3,047		4,108
Gas gathering facilities:
Development		32,520		53,387

Subtotal		1,382,001		1,589,299

Asset retirement obligations		29,695		24,061


Total – Continuing operations		1,411,696		1,613,360
Discontinued operations		—		3,241

Total costs incurred	$	1,411,696	$	1,616,601

^(a)	Includes cost incurred whether capitalized or expensed.

NEW ACCOUNTING STANDARDS (Policies)	9 Months Ended
NEW ACCOUNTING STANDARDS (Policies)	Sep. 30, 2012
Fair Value Measurement and Disclosure Requirements	In May 2011, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2011-04, “Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRS.” This pronouncement was issued to provide a consistent definition of fair value and ensure that the fair value measurement and disclosure requirements are similar between U.S. GAAP and International Financial Reporting Standards. ASU 2011-04 changes certain fair value measurement principles and enhances the disclosure requirements, particularly for Level 3 fair value measurements. This pronouncement is effective for reporting periods beginning on or after December 15, 2011, with early adoption prohibited. The new guidance requires prospective application. We adopted this new requirement in first quarter 2012 and it did not have a material effect on our consolidated financial statements.
Disclosures about offsetting Assets and Liabilities	In December 2011, the FASB issued ASU No. 2011-11, “Disclosures about Offsetting Assets and Liabilities” requiring additional disclosures about offsetting and related arrangements. ASU 2011-11 is effective retrospectively for annual reporting periods beginning on or after January 1, 2013. The adoption of ASU 2011-11 is not expected to impact our future financial position, results of operation or liquidity.

DISCONTINUED OPERATIONS (Tables)

9 Months Ended

Sep. 30, 2012

Components of Discontinued Operations

The following table represents the components of our Barnett Shale operations as discontinued operations for the three months and the nine months ended September 30, 2011 (in thousands).


	Three Months Ended September 30, 2011			Nine Months Ended September 30, 2011
Revenues and other income:
Natural gas, NGLs and oil sales	$	1,673		$	58,997
Other		—			10
Gain on the sale of assets		1,032			4,852

Total revenues and other income		2,705			63,859


Costs and expenses:
Direct operating		(611	)		9,835
Transportation, gathering and compression		950			5,240
Production and ad valorem taxes		(44	)		1,206
Exploration expense		—			37
Interest expense ^(a)		—			14,791
Depletion, depreciation and amortization		—			8,894

Total costs and expenses		295			40,003


Income before income taxes		2,410			23,856

Income tax expense
Current		—			—
Deferred		841			8,372

		841			8,372


Net income from discontinued operations	$	1,569		$	15,484

^(a)	Interest expense is allocated to discontinued operations based on the ratio of net assets of discontinued operations to our consolidated net assets plus long-term debt.

Composition of Liabilities of Discontinued Operations

The carrying values of our Barnett operations were included in discontinued operations in the accompanying consolidated balance sheets, which is comprised of the following (in thousands):


	December 31, 2011

Composition of liabilities of discontinued operations:
Accrued liabilities	$	653

Total current liabilities of discontinued operations	$	653

INCOME TAXES (Tables)

9 Months Ended

Sep. 30, 2012

Income Tax (Benefit) Expense from Continuing Operations

Income tax (benefit) expense from continuing operations was as follows (in thousands):


	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011

Income tax (benefit) expense	$	(29,074	)	$	22,540		$	(17,910	)	$	35,346
Effective tax rate		35.1	%		40.4	%		30.9	%		43.7	%

INCOME (LOSS) PER COMMON SHARE (Tables)

9 Months Ended

Sep. 30, 2012

Computations of Basic and Diluted (Loss) Income Per Common Share

The following tables set forth a reconciliation of income or loss attributable to common shareholders to basic income or loss attributable to common shareholders and to diluted income or loss attributable to common shareholders (in thousands except per share amounts):


	Three Months Ended September 30, 2012								Three Months Ended September 30, 2011
	Continuing Operations			Discontinued Operations		Total			Continuing Operations			Discontinued Operations			Total

(Loss) income as reported	$	(53,836	)	$	—	$	(53,836	)	$	33,186		$	1,569		$	34,755
Participating basic earnings ^(a)		(119	)		—		(119	)		(585	)		(28	)		(613	)

Basic (loss) income attributed to common shareholders		(53,955	)		—		(53,955	)		32,601			1,541			34,142
Reallocation of participating earnings ^(a)		—			—		—			3			—			3

Diluted (loss) income attributed to common shareholders	$	(53,955	)	$	—	$	(53,955	)	$	32,604		$	1,541		$	34,145


(Loss) income per common share:
Basic	$	(0.34	)	$	—	$	(0.34	)	$	0.21		$	0.01		$	0.22
Diluted	$	(0.34	)	$	—	$	(0.34	)	$	0.20		$	0.01		$	0.21

^(a)


	Nine Months Ended September 30, 2012								Nine Months Ended September 30, 2011
	Continuing Operations			Discontinued Operations		Total			Continuing Operations			Discontinued Operations			Total

(Loss) income as reported	$	(39,960	)	$	—	$	(39,960	)	$	45,531		$	15,484		$	61,015
Participating basic earnings ^(a)		(348	)		—		(348	)		(818	)		(278	)		(1,096	)

Basic (loss) income attributed to common shareholders		(40,308	)		—		(40,308	)		44,713			15,206			59,919
Reallocation of participating earnings ^(a)		—			—		—			3			2			5

Diluted (loss) income attributed to common shareholders	$	(40,308	)	$	—	$	(40,308	)	$	44,716		$	15,208		$	59,924


(Loss) income per common share:
Basic	$	(0.25	)	$	—	$	(0.25	)	$	0.28		$	0.10		$	0.38
Diluted	$	(0.25	)	$	—	$	(0.25	)	$	0.28		$	0.10		$	0.38

^(a)

Basic Weighted Average Common Shares Outstanding to Diluted Weighted Average Common Shares Outstanding

The following table provides a reconciliation of basic weighted average common shares outstanding to diluted weighted average common shares outstanding (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Denominator:
Weighted average common shares outstanding – basic		159,563		158,154		159,297		157,901
Effect of dilutive securities:
Director and employee stock options and SARs		—		1,168		—		1,038

Weighted average common shares outstanding – diluted		159,563		159,322		159,297		158,939

SUSPENDED EXPLORATORY WELL COSTS (Tables)

9 Months Ended

Sep. 30, 2012

Suspended Exploratory Well Costs

The following table reflects the changes in capitalized exploratory well costs for the nine months ended September 30, 2012 and the year ended December 31, 2011 (in thousands except for number of projects):


	September 30,			December 31,
	2012			2011
Balance at beginning of period	$	93,388		$	23,908
Additions to capitalized exploratory well costs pending the determination of proved reserves		186,087			86,996
Reclassifications to wells, facilities and equipment based on determination of proved reserves		(178,422	)		(17,516	)
Divested wells		(4,980	)		—

Balance at end of period		96,073			93,388
Less exploratory well costs that have been capitalized for a period of one year or less		(74,269	)		(83,860	)

Capitalized exploratory well costs that have been capitalized for a period greater than one year	$	21,804		$	9,528


Number of projects that have exploratory well costs that have been capitalized for a period greater than one year		8			3

Aging of Capitalized Exploratory Well Costs Suspended more than One Year

see Note 4. The following table provides an aging of capitalized exploratory well costs that have been suspended for more than one year as of September 30, 2012 (in thousands):


	Total		2012		2011		2010		2009		2008

Capitalized exploratory well costs that have been capitalized for more than one year	$	21,804	$	7,019	$	10,306	$	72	$	2,884	$	1,523

INDEBTEDNESS (Tables)

9 Months Ended

Sep. 30, 2012

Debt Outstanding


	September 30,		December 31,
	2012		2011

Bank debt (1.8%)	$	461,000	$	187,000

Senior subordinated notes:
7.50% senior subordinated notes due 2017		250,000		250,000
7.25% senior subordinated notes due 2018		250,000		250,000
8.00% senior subordinated notes due 2019, net of $11,131 and $12,033 discount, respectively		288,869		287,967
6.75% senior subordinated notes due 2020		500,000		500,000
5.75% senior subordinated notes due 2021		500,000		500,000
5.00% senior subordinated notes due 2022		600,000		—

Total debt	$	2,849,869	$	1,974,967

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

ASSET RETIREMENT OBLIGATIONS (Tables)

9 Months Ended

Sep. 30, 2012

Asset Retirement Obligations

A reconciliation of our liability for plugging and abandonment costs for the first nine months 2012 is as follows (in thousands):


	Nine Months Ended September 30, 2012

Beginning of period	$	84,810
Liabilities incurred		7,400
Liabilities settled		(3,073	)
Disposition of wells		(1,286	)
Accretion expense		6,444
Change in estimate		22,295

End of period		116,590

Less current portion		(5,005	)


Long-term asset retirement obligations	$	111,585

CAPITAL STOCK (Tables)

9 Months Ended

Sep. 30, 2012

Capital Stock

The following is a schedule of changes in the number of common shares outstanding since the beginning of 2011:


	Nine Months Ended September 30,		Year Ended December 31,
	2012		2011

Beginning balance		161,131,547		159,909,052
Stock options/SARs exercised		878,963		862,774
Restricted stock granted		354,674		326,591
Restricted stock units vested		55,588		—
Treasury shares issued		40,268		33,130

Ending balance		162,461,040		161,131,547

DERIVATIVE ACTIVITIES (Tables)

9 Months Ended

Sep. 30, 2012

Derivative Volumes Hedged and Average Hedge Prices

The following table sets forth our derivative volumes by year as of September 30, 2012.


Period	Contract Type	Volume Hedged	Weighted Average Hedge Price

Natural Gas
2012	Collars	279,641 Mmbtu/day	$ 4.76–$ 5.22
2013	Collars	240,000 Mmbtu/day	$ 4.73–$ 5.20
2014	Collars	325,000 Mmbtu/day	$ 3.75–$ 4.47
2012	Swaps	270,000 Mmbtu/day	$3.77
2013	Swaps	177,521 Mmbtu/day	$3.57

Crude Oil
2012	Collars	2,000 bbls/day	$ 70.00–$ 80.00
2013	Collars	3,000 bbls/day	$ 90.60–$ 100.00
2014	Collars	2,000 bbls/day	$ 85.55–$ 100.00
2012	Call Options	4,700 bbls/day	$85.00
2012	Put Options	2,500 bbls/day	$80.00
2013	Swaps	5,081 bbls/day	$96.59
2014	Swaps	4,000 bbls/day	$94.56

NGLs (Natural Gasoline)
2012	Sold Swaps	12,000 bbls/day	$96.28
2013	Sold Swaps	8,000 bbls/day	$89.64
2012	Purchased Swaps	5,500 bbls/day	$82.37
2013	Purchased Swaps	1,500 bbls/day	$76.30

NGLs (Propane)
2012	Swaps	6,000 bbls/day	$38.67
2013	Swaps	5,000 bbls/day	$35.55

Derivative Fair Value Income

The following table presents information about the components of derivative fair value (loss) income for the three months and the nine months ended September 30, 2012 and 2011 (in thousands):


	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011

Change in fair value of derivatives that do not qualify for hedge accounting ^(a)	$	(53,646	)	$	58,990		$	30,075		$	67,093
Realized gain (loss) on settlement – natural gas ^(a) ^(b)		—			5,334			—			8,424
Realized gain (loss) on settlement – oil ^(a) (b)		1,955			285			(1,899	)		(7,727	)
Realized gain (loss) on settlement – NGLs ^(a) (b)		14,682			3,087			20,442			3,087
Hedge ineffectiveness – realized		988			2,036			3,451			4,558
– unrealized		(4,707	)		(3,971	)		(5,061	)		2,531

Derivative fair value (loss) income	$	(40,728	)	$	65,761		$	47,008		$	77,966

^(a)	Derivatives that do not qualify for hedge accounting.

^(b)	These amounts represent the realized gains and losses on settled derivatives that do not qualify for hedge accounting, which before settlement are included in the category in this same table referred to as change in fair value of derivatives that do not qualify for hedge accounting.

Combined Fair Value of Derivatives, by Consolidated Balance Sheets

The assets and liabilities are netted where derivatives with both gain and loss positions are held by a single counterparty and we have master netting arrangements.


	September 30, 2012			December 31, 2011

Derivative assets:
Natural gas – swaps	$	(2,922	)	$	54,162
– collars		116,531			228,228
Crude oil – swaps		9,848			(263	)
– collars		(1,441	)		(16,607	)
– call options		(3,733	)		(29,348	)
– put options		46			—
NGLs – C5 swaps		33,864			15,328
– C3 swaps		296			—

	$	152,489		$	251,500

Derivative liabilities:
Natural gas – swaps	$	(2,764	)	$	—
– collars		(5,603	)		—
Crude oil – collars		141			—
– put options		31			—
NGLs – C5 swaps		2,378			(173	)
– C3 swaps		(7,416	)		—

	$	(13,233	)	$	(173	)

Fair Value of Derivative Contracts by Consolidated Balance Sheets


	September 30, 2012								December 31, 2011
	Assets		(Liabilities)						Assets		(Liabilities)
	Carrying Value		Carrying Value			Net Carrying Value			Carrying Value		Carrying Value			Net Carrying Value

Derivatives that qualify for cash flow hedge accounting :
Swaps ^(a)	$	24,344	$	(20,184	)	$	4,160		$	54,318	$	(419	)	$	53,899
Collars ^(a)		130,842		(18,816	)		112,026			228,228		(1,954	)		226,274
Put options ^(a)		77		—			77			—		—			—

	$	155,263	$	(39,000	)	$	116,263		$	282,546	$	(2,373	)	$	280,173


Derivatives that do not qualify for hedge accounting :
Sold swaps ^(a)	$	31,933	$	(7,594	)	$	24,339		$	17,949	$	(2,794	)	$	15,155
Purchased swaps ^(a)		5,571		(788	)		4,783			—		—			—
Collars ^(a)		—		(2,396	)		(2,396	)		—		(14,653	)		(14,653	)
Call options ^(a)		—		(3,733	)		(3,733	)		—		(29,348	)		(29,348	)

	$	37,504	$	(14,511	)	$	22,993		$	17,949	$	(46,795	)	$	(28,846	)

^(a)	Included in unrealized derivative gain or loss in the accompanying consolidated balance sheets.

Effects of Cash Flow Hedges and Other Hedges on Accumulated Other Comprehensive Income


	Three Months Ended September 30,												Nine Months Ended September 30,
	Change in Hedge Derivative Fair Value						Realized Gain (Loss) Reclassified from OCI into Revenue (a)						Change in Hedge Derivative Fair Value						Realized Gain (Loss) Reclassified from OCI into Revenue (a)
	2012			2011			2012			2011			2012			2011			2012			2011

Swaps	$	(33,311	)	$	15,739		$	18,204		$	—		$	22,525		$	17,854		$	69,851		$	—
Put options		(994	)		—			(682	)		—			(1,908	)		—			(998	)		—
Collars		(51,344	)		75,449			43,945			26,758			32,704			97,873			128,823			80,660
Collars – discontinued operations		—			—			—			—			—			412			—			8,607
Income taxes		33,403			(34,195	)		(23,972	)		(10,034	)		(21,780	)		(41,609	)		(76,805	)		(33,476	)

	$	(52,246	)	$	56,993		$	37,495		$	16,724		$	31,541		$	74,530		$	120,871		$	55,791

^(a)	For realized gains upon derivative contract settlement, the reduction in AOCI is offset by an increase in natural gas, NGLs and oil sales. For realized losses upon derivative contract settlement, the increase in AOCI is offset by a decrease in natural gas, NGLs and oil sales.

Effects of Non-Hedge Derivatives on Consolidated Statements of Operations


	Three Months Ended September 30,
	Gain (Loss) Recognized in Income (Non-hedge Derivatives)					Gain (Loss) Recognized in Income (Ineffective Portion)						Derivative Fair Value Income (Loss)
	2012			2011		2012			2011			2012			2011

Swaps	$	(45,998	)	$	26,219	$	(1,556	)	$	—		$	(47,554	)	$	26,219
Purchased swaps		12,822			—		—			—			12,822			—
Collars		(1,714	)		15,828		(2,163	)		(1,935	)		(3,877	)		13,893
Call options		(2,119	)		25,649		—			—			(2,119	)		25,649

Total	$	(37,009	)	$	67,696	$	(3,719	)	$	(1,935	)	$	(40,728	)	$	65,761


	Nine Months Ended September 30,
	Gain (Loss) Recognized in Income (Non-hedge Derivatives)					Gain (Loss) Recognized in Income (Ineffective Portion)					Derivative Fair Value Income (Loss)
	2012		2011			2012			2011		2012		2011

Swaps	$	30,330	$	39,968		$	(890	)	$	—	$	29,440	$	39,968
Purchased swaps		4,078		—			—			—		4,078		—
Collars		3,381		14,693			(720	)		7,089		2,661		21,782
Call options		10,829		16,259			—			—		10,829		16,259
Basis swaps		—		(43	)		—			—		—		(43	)

Total	$	48,618	$	70,877		$	(1,610	)	$	7,089	$	47,008	$	77,966

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41620-113959

+ Details

FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value

The following tables present the fair value hierarchy table for assets and liabilities measured at fair value, on a recurring basis (in thousands):


	Fair Value Measurements at September 30, 2012 using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Total Carrying Value as of September 30, 2012

Trading securities held in the deferred compensation plans	$	67,429	$	—		$	—	$	67,429

Derivatives – swaps		—		33,282			—		33,282
– collars		—		109,629			—		109,629
– call options		—		(3,732	)		—		(3,732	)
– put options		—		77			—		77


	Fair Value Measurements at December 31, 2011 using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Total Carrying Value as of December 31, 2011

Trading securities held in the deferred compensation plans	$	50,237	$	—		$	—	$	50,237

Derivatives – swaps		—		69,054			—		69,054
– collars		—		211,621			—		211,621
– call options		—		(29,348	)		—		(29,348	)

Value of Assets Measured at Fair Value on Non Recurring Basis

The following table presents the value of these assets measured at fair value on a nonrecurring basis (in thousands). All such fair value measurements represent Level 3 measurements.


	Three Months Ended September 30,								Nine Months Ended September 30,
	2012				2011				2012				2011
	Fair Value		Impairment		Fair Value		Impairment		Fair Value		Impairment		Fair Value		Impairment

Surface property	$	6,269	$	1,281	$	—	$	—	$	6,269	$	1,281	$	—	$	—
Natural gas and oil properties	$	—	$	—	$	24,388	$	38,681	$	—	$	—	$	24,388	$	38,681

Carrying Amounts and Fair Values of Financial Instruments

The following table presents the carrying amounts and the fair values of our financial instruments as of September 30, 2012 and December 31, 2011 (in thousands):


	September 30, 2012						December 31, 2011
	Carrying Value			Fair Value			Carrying Value			Fair Value
Assets:
Commodity swaps, collars, call and put options	$	152,489		$	152,489		$	251,500		$	251,500
Marketable securities^(a)		67,429			67,429			50,237			50,237

Liabilities:
Commodity swaps, collars, call and put options		(13,233	)		(13,233	)		(173	)		(173	)
Bank credit facility^(b)		(461,000	)		(461,000	)		(187,000	)		(187,000	)
7.50% senior subordinated notes due 2017^(b)		(250,000	)		(260,000	)		(250,000	)		(265,625	)
7.25% senior subordinated notes due 2018^(b)		(250,000	)		(264,375	)		(250,000	)		(267,500	)
8.00% senior subordinated notes due 2019^(b)		(288,869	)		(333,000	)		(287,967	)		(334,500	)
6.75% senior subordinated notes due 2020^(b)		(500,000	)		(550,000	)		(500,000	)		(555,000	)
5.75% senior subordinated notes due 2021^(b)		(500,000	)		(537,500	)		(500,000	)		(541,250	)
5.00% senior subordinated notes due 2022^(b)		(600,000	)		(633,000	)		—			—

^(a)	Marketable securities, which are held in our deferred compensation plans, and are actively traded on major exchanges.

^(b)	The book value of our bank debt approximates fair value because of its floating rate structure. The fair value of our senior subordinated notes is based on end of period market quotes which are Level 2 market values.

- Definition

Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611

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-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 19
-Subparagraph a, b, c(1), d(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 15
-Subparagraph b-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 18
-Subparagraph c(2), d, e, f
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph a, c(1), c(2), c(3), d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

STOCK-BASED COMPENSATION PLANS (Tables)

9 Months Ended

Sep. 30, 2012

Stock Option and SARs Activities

Information with respect to stock option and SARs activities is summarized below.


	Shares			Weighted Average Exercise Price

Outstanding at December 31, 2011		4,558,609		$	41.47
Granted		754,471			64.14
Exercised		(1,697,091	)		28.61
Expired/forfeited		(12,419	)		48.06

Outstanding at September 30, 2012		3,603,570		$	52.25

Weighted Average Grant Date Fair Value of SARs

The weighted average grant date fair value of these SARs, based on our Black-Scholes-Merton assumptions, is shown below:


	Nine Months Ended September 30, 2012

Weighted average exercise price per share	$	64.14
Expected annual dividends per share		0.25	%
Expected life in years		3.7
Expected volatility		45	%
Risk-free interest rate		0.5	%
Weighted average grant date fair value	$	21.32

Non-Vested Restricted Stock Outstanding

A summary of the status of our non-vested restricted stock outstanding at September 30, 2012 is summarized below:


	Equity Awards					Liability Awards
	Shares			Weighted Average Grant Date Fair Value		Shares			Weighted Average Grant Date Fair Value

Outstanding at December 31, 2011		221,609		$	49.64		487,244		$	48.76
Granted		359,732			63.37		370,385			63.90
Vested		(140,818	)		56.83		(324,433	)		51.30
Forfeited		(23,782	)		58.37		(2,093	)		50.50

Outstanding at September 30, 2012		416,741		$	58.56		531,103		$	57.76

SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

9 Months Ended

Sep. 30, 2012

Supplemental Cash Flow Information


	Nine Months Ended September 30,
	2012		2011
	(in thousands)
Net cash provided from operating activities included:
Income taxes paid to taxing authorities	$	436	$	309
Interest paid		99,828		95,536

Non-cash investing and financing activities included:
Asset retirement costs capitalized, net		29,695		13,569

COMMITMENTS AND CONTINGENCIES (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Future Minimum Firm Transportation and Gathering Contracts

As of September 30, 2012, future minimum firm transportation and gathering contracts are as follows (in thousands):


	Transportation and Gathering Contracts

2012 (remaining)	$	35,581
2013		145,981
2014		143,925
2015		153,468
2016		155,828
Thereafter		861,431

	$	1,496,214

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (Tables)

9 Months Ended

Sep. 30, 2012

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization


	September 30, 2012		December 31, 2011
	(in thousands)
Natural gas and oil properties:
Properties subject to depletion	$	7,219,474	$	6,035,429
Unproved properties		781,371		748,598

Total		8,000,845		6,784,027
Accumulated depreciation, depletion and amortization		(1,942,698)		(1,626,461)

Net capitalized costs	$	6,058,147	$	5,157,566

^(a)	Includes capitalized asset retirement costs and the associated accumulated amortization.

Costs Incurred for Property Acquisition, Exploration and Development (Tables)

9 Months Ended

Sep. 30, 2012

Costs Incurred for Property Acquisition, Exploration and Development


	Nine Months Ended September 30, 2012		Year Ended December 31, 2011
	(in thousands)
Acreage purchases	$	173,718	$	220,576
Development		855,650		1,007,049
Exploration:
Drilling		268,328		226,920
Expense		48,738		77,259
Stock-based compensation expense		3,047		4,108
Gas gathering facilities:
Development		32,520		53,387

Subtotal		1,382,001		1,589,299

Asset retirement obligations		29,695		24,061


Total – Continuing operations		1,411,696		1,613,360
Discontinued operations		—		3,241

Total costs incurred	$	1,411,696	$	1,616,601

^(a)	Includes cost incurred whether capitalized or expensed.

- Definition

Tabular disclosure of the aggregate of costs (whether the costs are capitalized or charged to expense at the time they are incurred ) incurred for the year in oil and gas property acquisition, exploration and development activities.

+ References + Details

Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Impact fee			$ 24,700
Period related to annual impact fee per well drilled			15 years
Abandonment and impairment expense	$ 40,118	$ 16,627	$ 104,048	$ 52,064
Southwest Oklahoma And North Texas [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Abandonment and impairment expense			19,600
PA unproved impairment [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Abandonment and impairment expense			$ 23,100

- Definition

The adjustment to expense previously capitalized costs of drilling exploratory wells when proved reserves are not found or when the entity obtains information that raises substantial doubt about the economic or operational viability of the project.

+ References + Details

Dispositions - Additional Information (Detail)	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
Dispositions - Additional Information (Detail)	Mar. 31, 2012 USD ($)	Mar. 31, 2011 USD ($)	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Sep. 30, 2012 USD ($) Well	Sep. 30, 2011 USD ($)	Dec. 31, 2011 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of oil and gas properties					$ 32,082,000	$ 40,264,000
Gain (Loss) on sale of oil and gas properties					$ (12,704,000)	(1,280,000)
Southern Oklahoma [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of productive wells \| Well					45
Purchase price					$ 135,000,000
Pennsylvania [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of oil and gas properties					13,900,000	5,400,000
Gain (Loss) on sale of oil and gas properties					$ 746,000	0
Overriding royalty in the prospect minimum					1.00%
Overriding royalty in the prospect maximum					5.00%
Barnett Shale Properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from the sale of natural gas properties							$ 889,300,000
Loss on derivative contracts				$ 1,700,000
Low pressure pipeline [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of pipeline		$ 14,700,000
Gain from sale of pipeline		$ 0
Marcellus Shale Properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of oil and gas properties			$ 2,500,000
Gain (Loss) on sale of oil and gas properties			$ (2,500,000)
East Texas [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of oil and gas properties	$ 8,600,000					10,500,000
Gain (Loss) on sale of oil and gas properties	$ (10,900,000)
Overriding royalty in the prospect minimum	2.50%
Overriding royalty in the prospect maximum	5.00%
Sale of oil and gas properties	75.00%
Impairment on oil and gas properties						$ 31,200,000

Discontinued Operations - Components of Discontinued Operations (Detail) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2012

Sep. 30, 2011

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Natural gas, NGLs and oil sales

$ 337,040

$ 304,230

$ 953,006

$ 841,546

Other

(2,368)

442

(3,084)

357

Gain on the sale of assets

949

203

(12,704)

(1,280)

Total revenues and other income

294,893

370,636

984,226

918,589

Direct operating

29,628

29,828

85,691

87,054

Transportation, gathering and compression

51,600

32,431

137,164

86,179

Production and ad valorem taxes

8,819

7,317

57,239

21,746

Exploration expense

14,752

17,606

51,785

56,385

Interest expense

43,997

34,181

124,090

90,343

Depletion, depreciation and amortization

123,059

93,619

332,012

244,129

Total costs and expenses

377,803

314,910

1,042,096

837,712

Income tax expense

Current

(7)

Deferred

(29,074)

22,547

(17,910)

35,345

Income Tax Expense Benefit

$ (29,074)

22,540

$ (17,910)

35,346

Net income from discontinued operations

1,569

15,484

Discontinued Operations [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Natural gas, NGLs and oil sales

1,673

58,997

Other

Gain on the sale of assets

1,032

4,852

Total revenues and other income

2,705

63,859

Direct operating

(611)

9,835

Transportation, gathering and compression

950

5,240

Production and ad valorem taxes

(44)

1,206

Exploration expense

Interest expense

^[1]

14,791

Depletion, depreciation and amortization

8,894

Total costs and expenses

295

40,003

Income before income taxes

2,410

23,856

Income tax expense

Current

Deferred

841

8,372

Income Tax Expense Benefit

841

8,372

Net income from discontinued operations

$ 1,569

$ 15,484

[1]	Interest expense is allocated to discontinued operations based on the ratio of net assets of discontinued operations to our consolidated net assets plus long-term debt.

Discontinued Operations - Composition of Liabilities of Discontinued Operations (Detail) $ in Thousands	Dec. 31, 2011 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accrued liabilities	$ 653
Total current liabilities of discontinued operations	$ 653

Income Taxes - Income Tax (Benefit) Expense from Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Tax Expense Benefit [Line Items]
Income tax (benefit) expense	$ (29,074)	$ 22,540	$ (17,910)	$ 35,346
Effective tax rate	35.10%	40.40%	30.90%	43.70%

Income Taxes - Additional Information (Detail)	3 Months Ended		9 Months Ended
Income Taxes - Additional Information (Detail)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statutory Tax Rate	35.00%	35.00%	35.00%	35.00%

Income (Loss) Per Common Share - Computations of Basic and Diluted (Loss) Income per Common Share (Detail) - USD ($)

3 Months Ended

9 Months Ended

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2012

Sep. 30, 2011

(Loss) income as reported

$ (53,836,000)

$ 34,755,000

$ (39,960,000)

$ 61,015,000

Participating basic earnings (a)

^[1]

(119,000)

(613,000)

(348,000)

(1,096,000)

Basic (loss) income attributed to common shareholders

(53,955,000)

34,142,000

(40,308,000)

59,919,000

Reallocation of participating earnings (a)

^[1]

3,000

5,000

Diluted (loss) income attributed to common shareholders

$ (53,955,000)

$ 34,145,000

$ (40,308,000)

$ 59,924,000

Basic

$ (0.34)

$ 0.22

$ (0.25)

$ 0.38

Diluted

$ (0.34)

$ 0.21

$ (0.25)

$ 0.38

Continuing Operations [Member]

(Loss) income as reported

$ (53,836,000)

$ 33,186,000

$ (39,960,000)

$ 45,531,000

Participating basic earnings (a)

^[1]

(119,000)

(585,000)

(348,000)

(818,000)

Basic (loss) income attributed to common shareholders

(53,955,000)

32,601,000

(40,308,000)

44,713,000

Reallocation of participating earnings (a)

^[1]

3,000

Diluted (loss) income attributed to common shareholders

(53,955,000)

32,604,000

(40,308,000)

44,716,000

Basic

(0.34)

0.21

(0.25)

0.28

Diluted

(0.34)

0.20

(0.25)

0.28

Discontinued Operations [Member]

(Loss) income as reported

1,569,000

15,484,000

Participating basic earnings (a)

^[1]

(28,000)

(278,000)

Basic (loss) income attributed to common shareholders

1,541,000

15,206,000

Reallocation of participating earnings (a)

^[1]

2,000

Diluted (loss) income attributed to common shareholders

1,541,000

15,208,000

Basic

0.01

0.10

Diluted

$ 0.01

$ 0.10

[1]

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.23)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 18
-Article 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 20
-Article 5

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Income (Loss) Per Common Share - Basic Weighted Average Common Shares Outstanding to Diluted Weighted Average Common Shares Outstanding (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Denominator:
Weighted average common shares outstanding - basic	159,563	158,154	159,297	157,901
Effect of dilutive securities:
Director and employee stock options and SARs		1,168		1,038
Weighted average common shares outstanding - diluted	159,563	159,322	159,297	158,939

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Income (Loss) Per Common Share - Additional Information (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Weighted Average Number of Shares, Restricted Stock Liability Awards	3,000,000	2,900,000	2,900,000	2,900,000
Stock appreciation rights excluded from earning per share calculation		347,000		855,000

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Suspended Exploratory Well Costs - Suspended Exploratory Well Costs (Detail) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2012 USD ($) Project	Dec. 31, 2011 USD ($) Project
Balance at beginning of period	$ 93,388	$ 23,908
Additions to capitalized exploratory well costs pending the determination of proved reserves	186,087	86,996
Reclassifications to wells, facilities and equipment based on determination of proved reserves	(178,422)	(17,516)
Divested wells	(4,980)
Balance at end of period	96,073	93,388
Less exploratory well costs that have been capitalized for a period of one year or less	(74,269)	(83,860)
Capitalized exploratory well costs that have been capitalized for a period greater than one year	$ 21,804	$ 9,528
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year \| Project	8	3

Suspended Exploratory Well Costs - Additional Information (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2012	Sep. 30, 2012 USD ($) Well	Dec. 31, 2011 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capitalized exploratory well costs that have been capitalized for more than one year \| $		$ 21,804	$ 9,528
Number of wells waiting on pipeline		5
Number of wells in the completion stage		3
Number of wells located in the Marcellus Shale area		7
East Texas [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of oil and gas properties	75.00%

Suspended Exploratory Well Costs - Aging of Capitalized Exploratory Well Costs Suspended more than One Year (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Aging Of Capitalized Exploratory Well Costs [Line Items]
Capitalized exploratory well costs that have been capitalized for more than one year	$ 21,804	$ 9,528
Exploratory well costs capitalized in year 2012
Aging Of Capitalized Exploratory Well Costs [Line Items]
Capitalized exploratory well costs that have been capitalized for more than one year	7,019
Exploratory well costs capitalized in year 2011
Aging Of Capitalized Exploratory Well Costs [Line Items]
Capitalized exploratory well costs that have been capitalized for more than one year	10,306
Exploratory well costs capitalized in year 2010
Aging Of Capitalized Exploratory Well Costs [Line Items]
Capitalized exploratory well costs that have been capitalized for more than one year	72
Exploratory well costs capitalized in year 2009
Aging Of Capitalized Exploratory Well Costs [Line Items]
Capitalized exploratory well costs that have been capitalized for more than one year	2,884
Exploratory well costs capitalized in year 2008
Aging Of Capitalized Exploratory Well Costs [Line Items]
Capitalized exploratory well costs that have been capitalized for more than one year	$ 1,523

Indebtedness - Additional Information (Detail)	1 Months Ended	3 Months Ended			9 Months Ended
Indebtedness - Additional Information (Detail)	Apr. 30, 2012 CommercialBank	Sep. 30, 2012 USD ($) Ratio CommercialBank	Mar. 31, 2012 USD ($)	Sep. 30, 2011 USD ($)	Sep. 30, 2012 USD ($) Ratio CommercialBank	Sep. 30, 2011 USD ($)	Feb. 15, 2020	Feb. 15, 2017	Dec. 31, 2011 USD ($)
Debt Instrument [Line Items]
Interest costs, capitalized during the period		$ 0		$ 0	$ 0	$ 0
Bank Credit facility, Facility amount		1,750,000,000			1,750,000,000
Bank Credit facility, Borrowing base		$ 2,000,000,000			$ 2,000,000,000
Number of commercial banks included in current bank group \| CommercialBank		28			28
Percentage holding of commercial banks, Maximum		9.00%			9.00%
Notice period for increase in facility amount					20 days
Number of commercial banks added to bank group \| CommercialBank	3
Outstanding balance under the bank credit facility		$ 461,000,000			$ 461,000,000				$ 187,000,000
Undrawn letters of credit		62,100,000			62,100,000
Borrowing capacity available under the facility amount		$ 1,200,000,000			$ 1,200,000,000
Maturity date of loan					Feb. 18, 2016
Weighted average interest rate on the bank credit facility		2.10%			2.20%	2.20%
Commitment fee					0.375%
Interest rate margin on LIBOR loans		1.50%			1.50%
Interest rate margin on base rate loans		0.50%			0.50%
Net proceeds after underwriting discounts and commissions					$ 600,000,000	$ 500,000,000
Proceeds to pay down our outstanding credit facility balance					$ 865,000,000	$ 764,826,000
Purchase price of senior subordinate notes as a percentage of principal		101.00%			101.00%
5.00% Senior Subordinated notes due 2022 [Member]
Debt Instrument [Line Items]
Aggregate principal amount of senior subordinated notes			$ 600,000,000
Net proceeds after underwriting discounts and commissions			589,500,000
Discount on Senior Subordinated notes			10,500,000
Maximum redemption price of notes as percentage of principal amount		105.00%			105.00%
Maximum percentage of original aggregate amount of notes that can be redeemed		35.00%			35.00%
Minimum percentage of original aggregate principal amount of notes to remain outstanding immediately after redemption		65.00%			65.00%
Interest rate on senior subordinated notes		5.00%			5.00%				5.00%
Maximum number of days after the date of the closing of the equity offering that the redemption should occur					60 days
Proceeds to pay down our outstanding credit facility balance			$ 350,000,000
Subsequent Event [Member] \| 5.00% Senior Subordinated notes due 2022 [Member]
Debt Instrument [Line Items]
Maximum redemption price of notes as percentage of principal amount							100.00%	102.50%
Maximum [Member]
Debt Instrument [Line Items]
Spread for Alternate Base Rate		1.50%			1.50%
Spread for LIBOR Rate		2.50%			2.50%
Annual rate of commitment fee paid on the undrawn balance		0.50%			0.50%
Ratio of debt to EBITDAX \| Ratio		4.25			4.25
Current ratio \| Ratio		1.0			1.0
Minimum [Member]
Debt Instrument [Line Items]
Spread for Alternate Base Rate		0.50%			0.50%
Spread for LIBOR Rate		1.50%			1.50%
Annual rate of commitment fee paid on the undrawn balance		0.375%			0.375%
Ratio of debt to EBITDAX \| Ratio		1.00			1.00
Current ratio \| Ratio		1.0			1.0

Indebtedness - Debt Outstanding (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Bank debt	$ 461,000	$ 187,000
Subordinated debt	2,388,869	1,787,967
Total debt	2,849,869	1,974,967
7.50% Senior Subordinated notes due 2017 [Member]
Debt Instrument [Line Items]
Subordinated debt	250,000	250,000
7.25% Senior Subordinated notes due 2018 [Member]
Debt Instrument [Line Items]
Subordinated debt	250,000	250,000
8.00% Senior Subordinated notes due 2019 [Member]
Debt Instrument [Line Items]
Subordinated debt	288,869	287,967
6.75% Senior Subordinated notes due 2020 [Member]
Debt Instrument [Line Items]
Subordinated debt	500,000	500,000
5.75% Senior Subordinated notes due 2021 [Member]
Debt Instrument [Line Items]
Subordinated debt	500,000	$ 500,000
5.00% Senior Subordinated notes due 2022 [Member]
Debt Instrument [Line Items]
Subordinated debt	$ 600,000

Indebtedness - Debt Outstanding (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Bank debt percentage	1.80%		1.80%
7.50% Senior Subordinated notes due 2017 [Member]
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	7.50%		7.50%
7.25% Senior Subordinated notes due 2018 [Member]
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	7.25%		7.25%
8.00% Senior Subordinated notes due 2019 [Member]
Debt Instrument [Line Items]
Discount on Senior Subordinated notes	$ 11,131		$ 12,033
Interest rate on senior subordinated notes	8.00%		8.00%
6.75% Senior Subordinated notes due 2020 [Member]
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	6.75%		6.75%
5.75% Senior Subordinated notes due 2021 [Member]
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	5.75%		5.75%
5.00% Senior Subordinated notes due 2022 [Member]
Debt Instrument [Line Items]
Discount on Senior Subordinated notes		$ 10,500
Interest rate on senior subordinated notes	5.00%		5.00%

Asset Retirement Obligations - Asset Retirement Obligations (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Asset Retirement Obligations [Line Items]
Beginning of period	$ 84,810
Liabilities incurred	7,400
Liabilities settled	(3,073)
Disposition of wells	(1,286)
Accretion expense	6,444
Change in estimate	22,295
End of period	116,590
Less current portion	(5,005)	$ (5,005)
Long-term asset retirement obligations	$ 111,585

Capital Stock - Additional Information (Detail) - shares	Sep. 30, 2012	Dec. 31, 2011
Equity [Line Items]
Authorized capital stock	485,000,000
Common stock, shares authorized	475,000,000	475,000,000
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued
Preferred stock, shares outstanding

Capital Stock - Capital Stock (Detail) - shares	9 Months Ended	12 Months Ended
Capital Stock - Capital Stock (Detail) - shares	Sep. 30, 2012	Dec. 31, 2011
Equity [Line Items]
Beginning balance	161,131,547	159,909,052
Stock options/SARs exercised	878,963	862,774
Restricted stock granted	354,674	326,591
Restricted stock units vested	55,588
Treasury shares issued	40,268	33,130
Ending balance	162,461,040	161,131,547

Derivative Activities - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012 USD ($) bbl Bcf $ / bbl $ / Mcf	Sep. 30, 2011 USD ($)	Sep. 30, 2012 USD ($) bbl Bcf Companies $ / bbl $ / Mcf	Sep. 30, 2011 USD ($)
Derivative [Line Items]
Unrealized pre-tax derivative gain expected to be reclassified into earnings \| $			$ 110,300
Gains (Losses) in oil and gas sales related to settled hedging transactions \| $	$ 61,500	$ 26,800	197,700	$ 80,700
Ineffective unrealized and realized gains (losses) recognized income \| $	$ (3,719)	$ (1,935)	$ (1,610)	$ 7,089
Number of financial institutions with whom we conduct derivative activities \| Companies			16
Number of counter parties not included in bank credit facility \| Companies			2
Swap Oil [Member]
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| bbl	3,300,000		3,300,000
Average price of SWAP per MCF \| $ / bbl	95.70		95.70
Collars Gas [Member]
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| Bcf	232.0		232.0
Average floor price \| $ / Mcf	4.23		4.23
Average cap price \| $ / Mcf	4.83		4.83
Collar Oil [Member]
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| bbl	2,000,000		2,000,000
Average floor price \| $ / bbl	86.88		86.88
Average cap price \| $ / bbl	98.17		98.17
Call Option Oil [Member]
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| bbl	400,000		400,000
Weighted average price \| $ / bbl	85.00		85.00
Put Option Oil [Member]
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| bbl	200,000		200,000
Weighted average price \| $ / bbl	80.00		80.00
Derivative assets liabilities at fair value net \| $	$ 139,300		$ 139,300
2012 [Member]
Derivative [Line Items]
Unrealized pre-tax derivative gain expected to be reclassified into earnings \| $			43,400
2013 [Member]
Derivative [Line Items]
Unrealized pre-tax derivative gain expected to be reclassified into earnings \| $			71,800
2014 [Member]
Derivative [Line Items]
Unrealized pre-tax derivative gain expected to be reclassified into earnings \| $			$ (4,900)
Natural gas [Member]
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| Bcf	89.6		89.6
Average price of SWAP per MCF \| $ / Mcf	3.62		3.62
NGL [Member]
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| bbl	3,000,000		3,000,000
Average price of SWAP per MCF \| $ / bbl	95.80		95.80
NGLs (C3Component) [Member]
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| bbl	2,400,000		2,400,000
Average price of SWAP per MCF \| $ / bbl	36.27		36.27

Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Detail)	Sep. 30, 2012 bbl MMBtu $ / bbl $ / MMBtu
Collars [Member] \| Natural Gas 2012 [Member]
Derivative [Line Items]
Volume Hedged \| MMBtu	279,641
Average floor price \| $ / MMBtu	4.76
Average cap price \| $ / MMBtu	5.22
Collars [Member] \| Natural Gas 2013 [Member]
Derivative [Line Items]
Volume Hedged \| MMBtu	240,000
Average floor price \| $ / MMBtu	4.73
Average cap price \| $ / MMBtu	5.20
Collars [Member] \| Natural Gas 2014 [Member]
Derivative [Line Items]
Volume Hedged \| MMBtu	325,000
Average floor price \| $ / MMBtu	3.75
Average cap price \| $ / MMBtu	4.47
Collars [Member] \| Crude Oil 2012 [Member]
Derivative [Line Items]
Volume Hedged \| bbl	2,000
Average floor price	70.00
Average cap price	80.00
Collars [Member] \| Crude Oil 2013 [Member]
Derivative [Line Items]
Volume Hedged \| bbl	3,000
Average floor price	90.60
Average cap price	100.00
Collars [Member] \| Crude Oil 2014 [Member]
Derivative [Line Items]
Volume Hedged \| bbl	2,000
Average floor price	85.55
Average cap price	100.00
Swaps [Member] \| Natural Gas 2012 [Member]
Derivative [Line Items]
Volume Hedged \| MMBtu	270,000
Average hedge price \| $ / MMBtu	3.77
Swaps [Member] \| Natural Gas 2013 [Member]
Derivative [Line Items]
Volume Hedged \| MMBtu	177,521
Average hedge price \| $ / MMBtu	3.57
Swaps [Member] \| Crude Oil 2013 [Member]
Derivative [Line Items]
Volume Hedged \| bbl	5,081
Average hedge price	96.59
Swaps [Member] \| Crude Oil 2014 [Member]
Derivative [Line Items]
Volume Hedged \| bbl	4,000
Average hedge price	94.56
Swaps [Member] \| NGLs Propane 2012 [Member]
Derivative [Line Items]
Volume Hedged \| bbl	6,000
Average hedge price	38.67
Swaps [Member] \| NGLs Propane 2013 [Member]
Derivative [Line Items]
Volume Hedged \| bbl	5,000
Average hedge price	35.55
Call options [Member] \| Crude Oil 2012 [Member]
Derivative [Line Items]
Volume Hedged \| bbl	4,700
Weighted average price	85
Put options [Member] \| Crude Oil 2012 [Member]
Derivative [Line Items]
Volume Hedged \| bbl	2,500
Weighted average price	80
Sold swaps [Member] \| NGLs Natural Gasoline 2012 [Member]
Derivative [Line Items]
Volume Hedged \| bbl	12,000
Average hedge price	96.28
Sold swaps [Member] \| NGLs Natural Gasoline 2013 [Member]
Derivative [Line Items]
Volume Hedged \| bbl	8,000
Average hedge price	89.64
Purchased swaps [Member] \| NGLs Natural Gasoline 2012 [Member]
Derivative [Line Items]
Volume Hedged \| bbl	5,500
Average hedge price	82.37
Purchased swaps [Member] \| NGLs Natural Gasoline 2013 [Member]
Derivative [Line Items]
Volume Hedged \| bbl	1,500
Average hedge price	76.30

Derivative Activities - Derivative Fair Value Income (Detail) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2012

Sep. 30, 2011

Derivatives, Fair Value [Line Items]

Change in fair value of derivatives that do not qualify for hedge accounting

^[1]

$ (53,646)

$ 58,990

$ 30,075

$ 67,093

Realized gain (loss) on settlement - natural gas

^[1],[2]

5,334

8,424

Realized gain (loss) on settlement - oil

^[1],[2]

1,955

285

(1,899)

(7,727)

Realized gain (loss) on settlement - NGLs

^[1],[2]

14,682

3,087

20,442

3,087

Hedge ineffectiveness - realized

988

2,036

3,451

4,558

- unrealized

(4,707)

(3,971)

(5,061)

2,531

Derivative fair value (loss) income

$ (40,728)

$ 65,761

$ 47,008

$ 77,966

[1]	Derivatives that do not qualify for hedge accounting.
[2]	These amounts represent the realized gains and losses on settled derivatives that do not qualify for hedge accounting, which before settlement are included in the category in this same table referred to as change in fair value of derivatives that do not qualify for hedge accounting.

Derivative Activities - Combined Fair Value of Derivatives, by Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Derivative assets:
Derivative assets	$ 152,489	$ 251,500
Derivative liabilities:
Derivative liabilities	(13,233)	(173)
Natural gas [Member] \| Swaps [Member]
Derivative assets:
Derivative assets	(2,922)	54,162
Derivative liabilities:
Derivative liabilities	(2,764)
Natural gas [Member] \| Collars [Member]
Derivative assets:
Derivative assets	116,531	228,228
Derivative liabilities:
Derivative liabilities	(5,603)
Crude oil [Member] \| Swaps [Member]
Derivative assets:
Derivative assets	9,848	(263)
Crude oil [Member] \| Collars [Member]
Derivative assets:
Derivative assets	(1,441)	(16,607)
Derivative liabilities:
Derivative liabilities	141
Crude oil [Member] \| Call options [Member]
Derivative assets:
Derivative assets	(3,733)	(29,348)
Crude oil [Member] \| Put options [Member]
Derivative assets:
Derivative assets	46
Derivative liabilities:
Derivative liabilities	31
NGL [Member] \| C5 swaps [Member]
Derivative assets:
Derivative assets	33,864	15,328
Derivative liabilities:
Derivative liabilities	2,378	$ (173)
NGL [Member] \| C3 swaps [Member]
Derivative assets:
Derivative assets	296
Derivative liabilities:
Derivative liabilities	$ (7,416)

Derivative Activities - Fair Value of Derivative Contracts by Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands

Sep. 30, 2012

Dec. 31, 2011

Derivatives, Fair Value [Line Items]

Assets Carrying Value

$ 155,263

$ 282,546

Liabilities Carrying Value

(39,000)

(2,373)

Net Carrying Value

116,263

280,173

Asset Carrying Value

37,504

17,949

Liabilities Carrying Value

(14,511)

(46,795)

Net Carrying Value

22,993

(28,846)

Sold swaps [Member]

Derivatives, Fair Value [Line Items]

Asset Carrying Value

^[1]

31,933

17,949

Liabilities Carrying Value

^[1]

(7,594)

(2,794)

Net Carrying Value

^[1]

24,339

15,155

Purchased swaps [Member]

Derivatives, Fair Value [Line Items]

Asset Carrying Value

^[1]

5,571

Liabilities Carrying Value

^[1]

(788)

Net Carrying Value

^[1]

4,783

Collars [Member]

Derivatives, Fair Value [Line Items]

Assets Carrying Value

^[1]

130,842

228,228

Liabilities Carrying Value

^[1]

(18,816)

(1,954)

Net Carrying Value

^[1]

112,026

226,274

Liabilities Carrying Value

^[1]

(2,396)

(14,653)

Net Carrying Value

^[1]

(2,396)

(14,653)

Call options [Member]

Derivatives, Fair Value [Line Items]

Liabilities Carrying Value

^[1]

(3,733)

(29,348)

Net Carrying Value

^[1]

(3,733)

(29,348)

Swaps [Member]

Derivatives, Fair Value [Line Items]

Assets Carrying Value

^[1]

24,344

54,318

Liabilities Carrying Value

^[1]

(20,184)

(419)

Net Carrying Value

^[1]

4,160

53,899

Put options [Member]

Derivatives, Fair Value [Line Items]

Assets Carrying Value

^[1]

Liabilities Carrying Value

^[1]

Net Carrying Value

^[1]

$ 77

[1]	Included in unrealized derivative gain or loss in the accompanying consolidated balance sheets.

Derivative Activities - Effects of Cash Flow Hedges and Other Hedges on Accumulated Other Comprehensive Income (Detail) - USD ($)

3 Months Ended

9 Months Ended

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2012

Sep. 30, 2011

Derivative Instruments, Gain (Loss) [Line Items]

Change in unrealized deferred hedging gains, tax effect,

$ 33,403,000

$ (34,195,000)

$ (21,780,000)

$ (41,609,000)

Change in Hedge Derivative Fair value, effects of Cash flow hedges on accumulated other comprehensive income (loss) total

(52,246,000)

56,993,000

31,541,000

74,530,000

Realized Gain Reclassified from AOCI into Revenue, Income taxes

^[1]

(23,972,000)

(10,034,000)

(76,805,000)

(33,476,000)

Realized gain on hedge derivative contract settlements reclassified into earnings from other comprehensive income, net of taxes

^[1]

37,495,000

16,724,000

120,871,000

55,791,000

Swaps [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Change in Hedge Derivative Fair Value

(33,311)

15,739

22,525

17,854

Realized Gain Reclassified from OCI into Revenue

^[1]

18,204

69,851

Put options [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Change in Hedge Derivative Fair Value

(994)

(1,908)

Realized Gain Reclassified from OCI into Revenue

^[1]

(682)

(998)

Collars [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Change in Hedge Derivative Fair Value

(51,344)

75,449

32,704

97,873

Realized Gain Reclassified from OCI into Revenue

^[1]

$ 43,945

$ 26,758

$ 128,823

80,660

Collars - discontinued operations [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Change in Hedge Derivative Fair Value

412

Realized Gain Reclassified from OCI into Revenue

^[1]

$ 8,607

[1]	For realized gains upon derivative contract settlement, the reduction in AOCI is offset by an increase in natural gas, NGLs and oil sales. For realized losses upon derivative contract settlement, the increase in AOCI is offset by a decrease in natural gas, NGLs and oil sales.

Derivative Activities - Effects of Non-Hedge Derivatives on Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative Financial Instruments [Line Items]
Gain (Loss)Recognized in Income (Non-hedge Derivatives	$ (37,009)	$ 67,696	$ 48,618	$ 70,877
Gain (Loss) Recognized in Income (Ineffective Portion)	(3,719)	(1,935)	(1,610)	7,089
Derivative Fair Value Income (Loss)	(40,728)	65,761	47,008	77,966
Swaps [Member]
Derivative Financial Instruments [Line Items]
Gain (Loss)Recognized in Income (Non-hedge Derivatives	(45,998)	26,219	30,330	39,968
Gain (Loss) Recognized in Income (Ineffective Portion)	(1,556)		(890)
Derivative Fair Value Income (Loss)	(47,554)	26,219	29,440	39,968
Purchased swaps [Member]
Derivative Financial Instruments [Line Items]
Gain (Loss)Recognized in Income (Non-hedge Derivatives	12,822		4,078
Derivative Fair Value Income (Loss)	12,822		4,078
Collars [Member]
Derivative Financial Instruments [Line Items]
Gain (Loss)Recognized in Income (Non-hedge Derivatives	(1,714)	15,828	3,381	14,693
Gain (Loss) Recognized in Income (Ineffective Portion)	(2,163)	(1,935)	(720)	7,089
Derivative Fair Value Income (Loss)	(3,877)	13,893	2,661	21,782
Call options [Member]
Derivative Financial Instruments [Line Items]
Gain (Loss)Recognized in Income (Non-hedge Derivatives	(2,119)	25,649	10,829	16,259
Derivative Fair Value Income (Loss)	$ (2,119)	$ 25,649	$ 10,829	16,259
Basis swaps [Member]
Derivative Financial Instruments [Line Items]
Gain (Loss)Recognized in Income (Non-hedge Derivatives				(43)
Derivative Fair Value Income (Loss)				$ (43)

Fair Value Measurements - Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities held in the deferred compensation plans	$ 67,429	$ 50,237
Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net	33,282	69,054
Collars [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net	109,629	211,621
Call options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net	(3,732)	(29,348)
Put options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net	77
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities held in the deferred compensation plans	67,429	50,237
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Collars [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Call options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Put options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities held in the deferred compensation plans
Significant Other Observable Inputs (Level 2) [Member] \| Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net	33,282	69,054
Significant Other Observable Inputs (Level 2) [Member] \| Collars [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net	109,629	211,621
Significant Other Observable Inputs (Level 2) [Member] \| Call options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net	(3,732)	(29,348)
Significant Other Observable Inputs (Level 2) [Member] \| Put options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net	77
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities held in the deferred compensation plans
Significant Unobservable Inputs (Level 3) [Member] \| Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net
Significant Unobservable Inputs (Level 3) [Member] \| Collars [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net
Significant Unobservable Inputs (Level 3) [Member] \| Call options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net
Significant Unobservable Inputs (Level 3) [Member] \| Put options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net

Fair Value Measurements - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)	Sep. 30, 2012 USD ($) Companies	Sep. 30, 2011 USD ($)	Dec. 31, 2011 USD ($)
Fair Value Measurements Of Financial Instruments [Line Items]
Interest and dividends	$ 122,000	$ 84,000	$ 279,000	$ 179,000
Mark-to-market gain (loss)	3,800,000	$ (7,900,000)	5,700,000	(6,600,000)
Proceeds from sale of oil and gas property and equipment			32,082,000	40,264,000
Allowance for uncollectible receivables	1,600,000		$ 1,600,000		$ 4,000,000
Number of financial institutions included in counter parties \| Companies			16
Number of counter parties not included in bank credit facility \| Companies			2
Net Derivative Asset	12,700,000		$ 12,700,000
Gulf Coast [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Impairment on oil and gas properties				7,500,000
East Texas [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Impairment on oil and gas properties				31,200,000
Proceeds from sale of oil and gas property and equipment				$ 10,500,000
Surface Property [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Impairment of long lived assets	$ 1,300,000

Fair Value Measurements - Value of Assets Measured at Fair Value on Non Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Surface Property [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Fair Value	$ 6,269		$ 6,269
Impairment	1,281		1,281
Impairment
Natural Gas and Oil Properties [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Fair Value		24,388		24,388
Impairment
Impairment		$ 38,681		$ 38,681

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 958
-SubTopic 225
-Section 45
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6743430&loc=d3e92212-112881

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Impairment
-URI http://asc.fasb.org/extlink&oid=6515133

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 26
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 7, 25
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Fair Value Measurements - Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands

Sep. 30, 2012

Dec. 31, 2011

Assets

Commodity swaps, collars, call and put options

$ 152,489

$ 251,500

Liabilities

Derivative Liabilities - Commodity swaps, collars, call and put options

13,233

173

Bank debt

(461,000)

(187,000)

Subordinated debt

$ (2,388,869)

(1,787,967)

7.50% Senior Subordinated Notes due 2017 [Member]

Liabilities

Interest rate on senior subordinated notes

7.50%

7.25% Senior Subordinated notes due 2018 [Member]

Liabilities

Subordinated debt

$ (250,000)

Interest rate on senior subordinated notes

7.25%

8.00% Senior Subordinated notes due 2019 [Member]

Liabilities

Subordinated debt

$ (288,869)

$ (287,967)

Interest rate on senior subordinated notes

8.00%

6.75% Senior Subordinated notes due 2020 [Member]

Liabilities

Subordinated debt

$ (500,000)

Interest rate on senior subordinated notes

6.75%

5.75% Senior Subordinated Notes due 2021 [Member]

Liabilities

Interest rate on senior subordinated notes

5.75%

5.00% Senior Subordinated notes due 2022 [Member]

Liabilities

Subordinated debt

$ (600,000)

Interest rate on senior subordinated notes

5.00%

Carrying Value [Member]

Assets

Commodity swaps, collars, call and put options

$ 152,489

$ 251,500

Marketable securities

^[1]

67,429

50,237

Liabilities

Derivative Liabilities - Commodity swaps, collars, call and put options

(13,233)

(173)

Bank debt

^[2]

(461,000)

(187,000)

Carrying Value [Member] | 7.50% Senior Subordinated Notes due 2017 [Member]

Liabilities

Subordinated debt

^[2]

(250,000)

Carrying Value [Member] | 7.25% Senior Subordinated notes due 2018 [Member]

Liabilities

Subordinated debt

^[2]

(250,000)

Carrying Value [Member] | 8.00% Senior Subordinated notes due 2019 [Member]

Liabilities

Subordinated debt

^[2]

(288,869)

(287,967)

Carrying Value [Member] | 6.75% Senior Subordinated notes due 2020 [Member]

Liabilities

Subordinated debt

^[2]

(500,000)

Carrying Value [Member] | 5.75% Senior Subordinated Notes due 2021 [Member]

Liabilities

Subordinated debt

^[2]

(500,000)

Carrying Value [Member] | 5.00% Senior Subordinated notes due 2022 [Member]

Liabilities

Subordinated debt

^[2]

(600,000)

Fair Value [Member]

Assets

Commodity swaps, collars, call and put options

152,489

251,500

Marketable securities

^[1]

67,429

50,237

Liabilities

Derivative Liabilities - Commodity swaps, collars, call and put options

(13,233)

(173)

Bank debt

^[2]

(461,000)

(187,000)

Fair Value [Member] | 7.50% Senior Subordinated Notes due 2017 [Member]

Liabilities

Subordinated debt

^[2]

(260,000)

(265,625)

Fair Value [Member] | 7.25% Senior Subordinated notes due 2018 [Member]

Liabilities

Subordinated debt

^[2]

(264,375)

(267,500)

Fair Value [Member] | 8.00% Senior Subordinated notes due 2019 [Member]

Liabilities

Subordinated debt

^[2]

(333,000)

(334,500)

Fair Value [Member] | 6.75% Senior Subordinated notes due 2020 [Member]

Liabilities

Subordinated debt

^[2]

(550,000)

(555,000)

Fair Value [Member] | 5.75% Senior Subordinated Notes due 2021 [Member]

Liabilities

Subordinated debt

^[2]

(537,500)

$ (541,250)

Fair Value [Member] | 5.00% Senior Subordinated notes due 2022 [Member]

Liabilities

Subordinated debt

^[2]

$ (633,000)

[1]	Marketable securities, which are held in our deferred compensation plans, and are actively traded on major exchanges.
[2]	The book value of our bank debt approximates fair value because of its floating rate structure. The fair value of our senior subordinated notes is based on end of period market quotes which are Level 2 market values.

Stock-based Compensation Plans - Additional Information (Detail)

3 Months Ended

9 Months Ended

12 Months Ended

Sep. 30, 2012

USD ($)

Sep. 30, 2011

USD ($)

Sep. 30, 2012

USD ($)

OptionPlan

$ / shares

Sep. 30, 2011

USD ($)

$ / shares

Dec. 31, 2011

USD ($)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting period

3 years

Expiration term of stock options

5 years

Operating expense

$ 29,628,000

$ 29,828,000

$ 85,691,000

$ 87,054,000

Exploration expense

14,752,000

17,606,000

51,785,000

56,385,000

General and administrative expense

44,497,000

35,907,000

127,231,000

108,986,000

Stock-Based Compensation Expense

$ 12,200,000

10,200,000

$ 36,800,000

33,200,000

Active equity based stock plans | OptionPlan

Number of Shares Outstanding Under the Plans | shares

3,603,570

4,558,609

Number of stock option outstanding | shares

32,450

Number of SARs outstanding | shares

3,600,000

Stock-based compensation expense

^[1]

$ 3,047,000

$ 4,108,000

Restricted Stock granted average price | $ / shares

$ 21.32

Non-cash, Mark-to-market income (loss) related to deferred compensation plan

$ 20,100,000

8,700,000

$ 21,600,000

33,600,000

Shares held in rabbi trust total | shares

2,800,000

Vested shares held in rabbi trust | shares

2,300,000

Share Based Compensation Expense [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Operating expense

$ (598,000)

(463,000)

$ (1,600,000)

(1,400,000)

Exploration expense

(1,100,000)

(902,000)

(3,000,000)

(3,200,000)

General and administrative expense

$ (10,100,000)

$ (8,500,000)

$ (30,800,000)

$ (27,500,000)

Equity Awards [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares granted to employees | shares

360,000

329,000

Vesting period of shares granted to employees

Stock-based compensation expense

$ 8,200,000

$ 2,900,000

Restricted Stock granted average price | $ / shares

$ 63.37

Restricted Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Restricted Stock granted average price | $ / shares

$ 63.37

$ 49.47

Liability Awards [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares granted to employees | shares

356,000

334,200

Stock-based compensation expense

$ 15,200,000

$ 14,600,000

Restricted Stock granted average price | $ / shares

$ 63.90

Restricted Stock granted to employees average price | $ / shares

63.88

$ 51.11

Restricted Stock granted to directors average price | $ / shares

$ 64.35

$ 52.35

Shares granted to directors | shares

14,700

15,500

[1]	Includes cost incurred whether capitalized or expensed.

Stock-based Compensation Plans - Stock Option and SARs Activities (Detail)	9 Months Ended
	Sep. 30, 2012 $ / shares shares
Schedule Of Stock Options [Line Items]
Beginning Balance, Weighted Average Exercise Price \| $ / shares	$ 41.47
Granted, Weighted Average Exercise Price \| $ / shares	64.14
Exercised, Weighted Average Exercise Price \| $ / shares	28.61
Expired/forfeited, Weighted Average Exercise Price \| $ / shares	48.06
Ending Balance, Weighted Average Exercise Price \| $ / shares	$ 52.25
Beginning Balance, Shares \| shares	4,558,609
Granted, Shares \| shares	754,471
Exercised, Shares \| shares	(1,697,091)
Expired/forfeited, Shares \| shares	(12,419)
Ending Balance, Shares \| shares	3,603,570

Stock-based Compensation Plans - Weighted Average Grant Date Fair Value of SARs (Detail)	9 Months Ended
	Sep. 30, 2012 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price per share	$ 64.14
Expected annual dividends per share	0.25%
Expected life in years	3 years 8 months 12 days
Expected volatility	45.00%
Risk-free interest rate	0.50%
Weighted average grant date fair value	$ 21.32

Stock-based Compensation Plans - Non-Vested Restricted Stock Outstanding (Detail)	9 Months Ended
	Sep. 30, 2012 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted \| $ / shares	$ 21.32
Vested, Shares \| shares	(55,588)
Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Weighted Average Grant Date Fair Value \| $ / shares	$ 49.64
Granted \| $ / shares	63.37
Vested \| $ / shares	56.83
Forfeited \| $ / shares	58.37
Ending Balance, Weighted Average Grant Date Fair Value \| $ / shares	$ 58.56
Beginning Balance, Shares \| shares	221,609
Granted, Shares \| shares	359,732
Vested, Shares \| shares	(140,818)
Forfeited, Shares \| shares	(23,782)
Ending Balance, Shares \| shares	416,741
Liability Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Weighted Average Grant Date Fair Value \| $ / shares	$ 48.76
Granted \| $ / shares	63.90
Vested \| $ / shares	51.30
Forfeited \| $ / shares	50.50
Ending Balance, Weighted Average Grant Date Fair Value \| $ / shares	$ 57.76
Beginning Balance, Shares \| shares	487,244
Granted, Shares \| shares	370,385
Vested, Shares \| shares	(324,433)
Forfeited, Shares \| shares	(2,093)
Ending Balance, Shares \| shares	531,103

Supplemental Cash Flow Information - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Net cash provided from operating activities included:
Income taxes paid to taxing authorities	$ 436	$ 309
Interest paid	99,828	95,536
Non-cash investing and financing activities included:
Asset retirement costs capitalized, net	$ 29,695	$ 13,569

Commitments and Contingencies - Schedule of Future Minimum Firm Transportation and Gathering Contracts (Detail) $ in Thousands	Sep. 30, 2012 USD ($)
Contingencies And Commitments [Line Items]
2012 (remaining)	$ 35,581
2013	145,981
2014	143,925
2015	153,468
2016	155,828
Thereafter	861,431
Transportation Commitments Future Minimum Transportation Fees Due, Total	$ 1,496,214

Commitments and Contingencies - Additional Information (Detail) $ in Millions	Sep. 30, 2012 USD ($) Contract Year
Commitments And Contingencies Disclosure [Line Items]
Number of drilling rigs used under drilling contracts \| Contract	3
Maximum period of drilling contracts in years \| Year	4
Maximum penalties on early termination of drilling contracts	$ 30.0
Two Thousand And Twelve [Member]
Commitments And Contingencies Disclosure [Line Items]
Drilling contracts future minimum commitments	5.9
Two Thousand And Thirteen [Member]
Commitments And Contingencies Disclosure [Line Items]
Drilling contracts future minimum commitments	23.2
Two Thousand And Fourteen [Member]
Commitments And Contingencies Disclosure [Line Items]
Drilling contracts future minimum commitments	9.9
Two Thousand And Fifteen [Member]
Commitments And Contingencies Disclosure [Line Items]
Drilling contracts future minimum commitments	$ 2.2

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization - Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (Detail) - USD ($)
$ in Thousands

Sep. 30, 2012

Dec. 31, 2011

Natural gas and oil properties:

Properties subject to depletion

^[1]

$ 7,219,474

$ 6,035,429

Unproved properties

^[1]

781,371

748,598

Total

^[1]

8,000,845

6,784,027

Accumulated depreciation, depletion and amortization

^[1]

(1,942,698)

(1,626,461)

Net capitalized costs

^[1]

$ 6,058,147

$ 5,157,566

[1]	Includes capitalized asset retirement costs and the associated accumulated amortization.

Costs Incurred for Property Acquisition, Exploration and Development - Costs Incurred for Property Acquisition, Exploration and Development (Detail) - USD ($)
$ in Thousands

9 Months Ended

12 Months Ended

Sep. 30, 2012

Dec. 31, 2011

Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]

Acreage purchases

^[1]

$ 173,718

$ 220,576

Development

^[1]

855,650