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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2012	Jul. 23, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	RANGE RESOURCES CORP
Entity Central Index Key	0000315852
Document Type	10-Q
Document Period End Date	Jun. 30, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Company Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock Shares Outstanding		162,485,399

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 158	$ 92
Accounts receivable, less allowance for doubtful accounts of $2,783 and $4,015	104,952	127,180
Unrealized derivative gain	251,236	173,921
Inventory and other	15,997	14,070
Total current assets	372,343	315,263
Unrealized derivative gain	97,750	77,579
Equity method investments	135,825	138,130
Natural gas and oil properties, successful efforts method	7,596,430	6,784,027
Accumulated depletion and depreciation	(1,825,390)	(1,626,461)
Natural gas and oil properties, successful efforts method	5,771,040	5,157,566
Transportation and field assets	117,519	123,349
Accumulated depreciation and amortization	(70,901)	(70,671)
Transportation and field assets	46,618	52,678
Other assets	120,318	104,254
Total assets	6,543,894	5,845,470
Current liabilities:
Accounts payable	266,412	311,369
Asset retirement obligations	5,005	5,005
Accrued liabilities	144,765	109,109
Liabilities of discontinued operations		653
Deferred tax liability	82,170	56,595
Accrued interest	38,865	29,201
Unrealized derivative loss	3,283
Total current liabilities	540,500	511,932
Bank debt	235,000	187,000
Subordinated notes	2,388,562	1,787,967
Deferred tax liability	698,429	710,490
Unrealized derivative loss	2,405	173
Deferred compensation liability	170,763	169,188
Asset retirement obligations and other liabilities	91,514	86,300
Total liabilities	4,127,173	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, 162,483,363 issued at June 30, 2012 and 161,302,973 issued at December 31, 2011	1,624	1,613
Common stock held in treasury, 153,806 shares at June 30, 2012 and 171,426 shares at December 31, 2011	(5,655)	(6,343)
Additional paid-in capital	1,888,841	1,866,554
Retained earnings	374,873	373,969
Accumulated other comprehensive income	157,038	156,627
Total stockholders' equity	2,416,721	2,392,420
Total liabilities and stockholders' equity	$ 6,543,894	$ 5,845,470

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts on accounts receivable	$ 2,783	$ 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	162,483,363	161,302,973
Common stock held in treasury, shares	153,806	171,426

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues and other income:
Natural gas, NGLs and oil sales	$ 298,349	$ 285,353	$ 615,966	$ 537,316
Derivative fair value income	148,569	53,039	87,736	12,205
Loss on the sale of assets	(3,227)	(1,622)	(13,653)	(1,483)
Other	(1,251)	(1,475)	(716)	(85)
Total revenues and other income	442,440	335,295	689,333	547,953
Costs and expenses:
Direct operating	27,041	28,509	56,063	57,226
Transportation, gathering and compression	44,744	28,666	85,564	53,748
Production and ad valorem taxes	11,786	7,550	48,420	14,429
Exploration	15,517	11,592	37,033	38,779
Abandonment and impairment of unproved properties	43,641	18,900	63,930	35,437
General and administrative	44,005	39,120	82,734	73,079
Deferred compensation plan	9,333	(5,778)	1,503	24,852
Interest expense	42,888	31,383	80,093	56,162
Loss on early extinguishment of debt		18,580		18,580
Depletion, depreciation and amortization	108,802	78,294	208,953	150,510
Total costs and expenses	347,757	256,816	664,293	522,802
Income from continuing operations before income taxes	94,683	78,479	25,040	25,151
Income tax expense
Current		8		8
Deferred	39,007	32,695	11,164	12,798
Total income tax expense	39,007	32,703	11,164	12,806
Income from continuing operations	55,676	45,776	13,876	12,345
Discontinued operations, net of taxes		5,517		13,915
Net income	$ 55,676	$ 51,293	$ 13,876	$ 26,260
Income per common share:
Basic-income from continuing operations	$ 0.34	$ 0.28	$ 0.09	$ 0.08
-discontinued operations		0.04		0.08
-net income	0.34	0.32	0.09	0.16
Diluted-income from continuing operations	0.34	0.28	0.09	0.08
-discontinued operations		0.04		0.08
-net income	0.34	0.32	0.09	0.16
Dividends per common share	$ 0.04	$ 0.04	$ 0.08	$ 0.08
Weighted average common shares outstanding:
Basic	159,412	157,997	159,162	157,772
Diluted	160,030	158,833	159,949	158,729

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Statements of Comprehensive Income (loss) [Abstract]
Net income	$ 55,676	$ 51,293	$ 13,876	$ 26,260
Other comprehensive income:
Realized loss (gain) on hedge derivative contract settlements reclassified into earnings from other comprehensive income, net of taxes	(47,934)	(15,178)	(83,376)	(39,068)
Change in unrealized deferred hedging gains, net of taxes	4,813	17,424	83,787	17,537
Total comprehensive income	$ 12,555	$ 53,539	$ 14,287	$ 4,729

- 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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+ Details

- 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 (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating activities:
Net income	$ 13,876	$ 26,260
Adjustments to reconcile net income to net cash provided from operating activities:
Gain from discontinued operations		(13,915)
Income (loss) from equity method investments, net of distributions	2,293	15,102
Deferred income tax expense	11,164	12,798
Depletion, depreciation and amortization	208,953	150,510
Exploration dry hole costs	817	6
Mark-to-market on natural gas, NGL and oil derivatives not designated as hedges	(83,721)	(8,103)
Abandonment and impairment of unproved properties	63,930	35,437
Unrealized derivative loss (gain)	354	(6,502)
Allowance for bad debts		(404)
Amortization of deferred financing costs, loss on extinguishment of debt and other	3,893	21,678
Deferred and stock-based compensation	26,341	48,161
Loss on the sale of assets	13,653	1,483
Changes in working capital:
Accounts receivable	11,611	(9,999)
Inventory and other	(2,824)	2,769
Accounts payable	(21,922)	5,015
Accrued liabilities and other	34,528	7,655
Net cash provided from continuing operations	282,946	287,951
Net cash provided from discontinued operations		21,554
Net cash provided from operating activities	282,946	309,505
Investing activities:
Additions to natural gas and oil properties	(781,574)	(536,776)
Additions to field service assets	(1,526)	(2,829)
Acreage purchases	(147,944)	(73,070)
Proceeds from disposal of assets	15,620	23,409
Purchase of marketable securities held by the deferred compensation plan	(7,872)	(8,832)
Proceeds from the sales of marketable securities held by the deferred compensation plan	3,590	6,620
Net cash used in investing activities from continuing operations	(919,706)	(591,478)
Net cash provided from investing activities from discontinued operations		840,723
Net cash (used in) provided from investing activities	(919,706)	249,245
Financing activities:
Borrowing on credit facilities	697,000	490,826
Repayment on credit facilities	(649,000)	(764,826)
Issuance of subordinated notes	600,000	500,000
Repayment of subordinated notes		(413,332)
Dividends paid	(12,972)	(12,860)
Debt issuance costs	(12,455)	(21,653)
Issuance of common stock	2,074	554
Change in cash overdrafts	3,346	(58,265)
Proceeds from the sales of common stock held by the deferred compensation plan	8,833	6,797
Net cash provided from (used in) financing activities	636,826	(272,759)
Increase in cash and cash equivalents	66	285,991
Cash and cash equivalents at beginning of period	92	2,848
Cash and cash equivalents at end of period	$ 158	$ 288,839

Summary of Organization and Nature of Business

6 Months Ended

Jun. 30, 2012

Summary of Organization and Nature of Business [Abstract]

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 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

6 Months Ended

Jun. 30, 2012

Basis of Presentation [Abstract]

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 six months ended June 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 disclosed otherwise. 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. This reclassification includes third party transportation and gathering costs which were 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 and as a result, we have recorded in the first six months ended June 30, 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. 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. 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.

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 also 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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+ Details

New Accounting Standards

6 Months Ended

Jun. 30, 2012

New Accounting Standards [Abstract]

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

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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 250
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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

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-Name Accounting Standards Codification
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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

6 Months Ended

Jun. 30, 2012

Dispositions [Abstract]

DISPOSITIONS

(4)

DISPOSITIONS

2012 Dispositions

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.

2011 Dispositions

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

6 Months Ended

Jun. 30, 2012

Discontinued Operations [Abstract]

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 six months ended June 30, 2011 (in thousands).


	Three Months Ended June 30, 2011		Six Months Ended June 30, 2011
Revenues and other income:
Natural gas, NGLs and oil sales	$	12,751	$	57,324
Other		1		10
Gain on the sale of assets		3,820		3,820

Total revenues and other income		16,572		61,154


Costs and expenses:
Direct operating		2,169		10,446
Transportation, gathering and compression		1,974		4,290
Production and ad valorem taxes		184		1,250
Exploration expense		5		37
Interest expense ^(a)		3,715		14,791
Depletion, depreciation and amortization		14		8,894

Total costs and expenses		8,061		39,708


Income before income taxes		8,511		21,446

Income tax expense
Current		—		—
Deferred		2,994		7,531

		2,994		7,531


Net income from discontinued operations	$	5,517	$	13,915

^(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
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-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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-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

6 Months Ended

Jun. 30, 2012

Income Taxes [Abstract]

INCOME TAXES

(6)

INCOME TAXES

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


	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011

Income tax expense	$	39,007		$	32,703		$	11,164		$	12,806
Effective tax rate		41.2	%		41.7	%		44.6	%		50.9	%

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 second quarter and six months ended June 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 Per Common Share

6 Months Ended

Jun. 30, 2012

Income (Loss) Per Common Share [Abstract]

INCOME (LOSS) PER COMMON SHARE

(7)

INCOME 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 table sets 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 June 30, 2012								Three Months Ended June 30, 2011
	Continuing Operations			Discontinued Operations		Total			Continuing Operations			Discontinued Operations			Total

Income as reported	$	55,676		$	—	$	55,676		$	45,776		$	5,517		$	51,293
Participating basic earnings ^(a)		(999	)		—		(999	)		(808	)		(97	)		(905	)

Basic income attributed to common shareholders		54,677			—		54,677			44,968			5,420			50,388
Reallocation of participating earnings ^(a)		3			—		3			4			1			5

Diluted income attributed to common shareholders	$	54,680		$	—	$	54,680		$	44,972		$	5,421		$	50,393


Income per common share:
Basic	$	0.34		$	—	$	0.34		$	0.28		$	0.04		$	0.32
Diluted	$	0.34		$	—	$	0.34		$	0.28		$	0.04		$	0.32

^(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.


	Six Months Ended June 30, 2012								Six Months Ended June 30, 2011
	Continuing Operations			Discontinued Operations		Total			Continuing Operations			Discontinued Operations			Total

Income as reported	$	13,876		$	—	$	13,876		$	12,345		$	13,915		$	26,260
Participating basic earnings ^(a)		(246	)		—		(246	)		(220	)		(248	)		(468	)

Basic income attributed to common shareholders		13,630			—		13,630			12,125			13,667			25,792
Reallocation of participating earnings ^(a)		—			—		—			—			1			1

Diluted income attributed to common shareholders	$	13,630		$	—	$	13,630		$	12,125		$	13,668		$	25,793


Income per common share:
Basic	$	0.09		$	—	$	0.09		$	0.08		$	0.08		$	0.16
Diluted	$	0.09		$	—	$	0.09		$	0.08		$	0.08		$	0.16

^(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 June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Denominator:
Weighted average common shares outstanding – basic		159,412		157,997		159,162		157,772
Effect of dilutive securities:
Director and employee stock options and SARs		618		836		787		957

Weighted average common shares outstanding – diluted		160,030		158,833		159,949		158,729

Weighted average common shares – basic for the three months ended June 30, 2012 excludes 2.9 million shares and the three months ended June 30, 2011 excludes 2.8 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 six months ended June 30, 2012 and 2011 excludes 2.9 million shares of restricted stock. SARs of 761,000 for the three months ended June 30, 2012 and 592,000 for the six months ended June 30, 2012 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. SARs of 860,000 for the three months ended June 30, 2011 and 1.0 million for the six months ended June 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

6 Months Ended

Jun. 30, 2012

Suspended Exploratory Well Costs/Capitalized Costs and Accumulated Depreciation, Depletion and Amortization/Costs Incurred for Property Acquisition, Exploration and Development [Abstract]

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 six months ended June 30, 2012 and the year ended December 31, 2011 (in thousands except for number of projects):


	June 30, 2012			December 31, 2011

Balance at beginning of period	$	93,388		$	23,908
Additions to capitalized exploratory well costs pending the determination of proved reserves		150,136			86,996
Reclassifications to wells, facilities and equipment based on determination of proved reserves		(178,423	)		(17,516	)
Divested wells		(4,980	)		—
Capitalized exploratory well costs charged to expense		—			—

Balance at end of period		60,121			93,388
Less exploratory well costs that have been capitalized for a period of one year or less		(39,107	)		(83,860	)

Capitalized exploratory well costs that have been capitalized for a period greater than one year	$	21,014		$	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 June 30, 2012, $21.0 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 the 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 June 30, 2012 (in thousands):


	Total		2012		2011		2010		2009		2008

Capitalized exploratory well costs that have been capitalized for more than one year	$	21,014	$	6,933	$	9,602	$	72	$	2,884	$	1,523

Indebtedness

6 Months Ended

Jun. 30, 2012

Indebtedness [Abstract]

INDEBTEDNESS

(9)

INDEBTEDNESS

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


	June 30, 2012		December 31, 2011

Bank debt (2.2%)	$	235,000	$	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 $11,438 and $12,033 discount, respectively		288,562		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	$	2,623,562	$	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 June 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. Our current bank group is comprised of twenty-eight financial institutions, with no one bank holding more than 9% of the total facility which 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 June 30, 2012, the outstanding balance under our bank credit facility was $235.0 million as well as $62.1 million of undrawn letters of credit leaving $1.5 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 2.7% for the three months ended June 30, 2012 compared to 2.0% for the three months ended June 30, 2011. The weighted average interest rate was 2.3% for the six months ended June 30, 2012 compared to 2.2% for the six months ended June 30, 2011. A commitment fee is paid on the undrawn balance based on an annual rate of 0.375% to 0.50%. At June 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 redemption prices 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 June 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 June 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

6 Months Ended

Jun. 30, 2012

Asset Retirement Obligation [Abstract]

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 first six months ended June 30, 2012 is as follows (in thousands):


	Six Months Ended June 30, 2012

Beginning of period	$	84,810
Liabilities incurred		4,009
Liabilities settled		(2,142	)
Disposition of wells		(151	)
Accretion expense		3,668
Change in estimate		(5	)

End of period		90,189

Less current portion		(5,005	)


Long-term asset retirement obligations	$	85,184

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

Capital Stock

6 Months Ended

Jun. 30, 2012

Capital Stock [Abstract]

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:


	Six Months Ended June 30, 2012		Year Ended December 31, 2011

Beginning balance		161,131,547		159,909,052
Stock options/SARs exercised		773,299		862,774
Restricted stock grants		354,674		326,591
Restricted stock units vested		52,417		—
Treasury shares		17,620		33,130

Ending balance		162,329,557		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
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-SubTopic 10
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-Subparagraph (SX 210.4-08.(d),(e))
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-Topic 210
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-Name Accounting Standards Codification
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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 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
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Reference 20: http://www.xbrl.org/2003/role/presentationRef
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Reference 21: http://www.xbrl.org/2003/role/presentationRef
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Reference 23: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
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+ Details

Derivative Activities

6 Months Ended

Jun. 30, 2012

Derivative Activities [Abstract]

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 natural gas liquids (“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 natural gas liquids. At June 30, 2012, we had open swap contracts covering 106.2 Bcf of natural gas at prices averaging $3.64 per mcf, 3.2 million barrels of oil at prices averaging $95.61 per barrel, 3.6 million net barrels of NGLs (the C5 component of NGLs) at prices averaging $97.85 per barrel and 2.9 million barrels of NGLs (the C3 component of NGLs) at prices averaging $36.73 per barrel. At June 30, 2012, we had collars covering 228.5 Bcf of natural gas at weighted average floor and cap prices of $4.35 to $4.93 per mcf and 2.2 million barrels of oil at weighted average floor and cap prices of $85.46 to $96.64 per barrel. At June 30, 2012, we also had sold call options for 0.9 million barrels of oil at a weighted average price of $85.00 per barrel and purchased put options for 0.5 million barrels of oil at a weighted average price of $80.00. Their fair value, 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 $343.3 million at June 30, 2012. These contracts expire monthly through December 2014. The following table sets forth our derivative volumes by year as of June 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	245,000 Mmbtu/day	$ 3.74–$ 4.50
2012	Swaps	245,000 Mmbtu/day	$3.75
2013	Swaps	167,521 Mmbtu/day	$3.56

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 Option	2,500 bbls/day	$80.00
2013	Swaps	6,313 bbls/day	$96.49
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 June 30, 2012, an unrealized pre-tax derivative gain of $257.4 million was recorded in AOCI. This gain will be reclassified into earnings as a gain of $114.5 million in 2012, a gain of $121.9 million in 2013 and a gain of $21.0 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.

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 June 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 $78.6 million of gains in second quarter 2012 compared to gains of $24.3 million in the same period of 2011 related to settled hedging transactions. Natural gas, NGLs and oil sales include $136.2 million of gains in the first six months 2012 compared to $53.9 million in the same period of 2011. Any ineffectiveness associated with these hedge derivatives are reflected in derivative fair value income in the accompanying statements of operations. The ineffective portion is 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 for the three months ended June 30, 2012 includes ineffective gains (unrealized and realized) of $1.9 million compared to $7.5 million in the three months ended June 30, 2011. Derivative fair value income for the six months ended June 30, 2012 includes ineffective gains (unrealized and realized) of $2.1 million compared to $9.0 million in the same period of 2011.

Derivative fair value income

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


	Three Months Ended June 30,					Six Months Ended June 30,
	2012		2011			2012			2011

Change in fair value of derivatives that do not qualify for hedge accounting ^(a)	$	135,777	$	48,139		$	83,721		$	8,103
Realized gain (loss) on settlement – natural gas ^(a) ^(b)		—		3,484			—			3,090
Realized gain (loss) on settlement – oil ^{(a) (b)}		768		(6,094	)		(3,854	)		(8,012	)
Realized gain (loss) on settlement – NGLs ^{(a) (b)}		10,152		—			5,760			—
Hedge ineffectiveness – realized		1,278		1,576			2,463			2,522
– unrealized		594		5,934			(354	)		6,502

Derivative fair value income	$	148,569	$	53,039		$	87,736		$	12,205

^(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 June 30, 2012 and December 31, 2011 is summarized below (in thousands). As of June 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.


	June 30, 2012			December 31, 2011

Derivative assets:
Natural gas – swaps	$	33,637		$	54,162
– collars		208,178			228,228
Crude oil – swaps		23,744			(263	)
– collars		5,254			(16,607	)
– call options		(4,723	)		(29,348	)
– put options		1,071			—
NGLs – C5 swaps		79,492			15,328
– C3 swaps		2,333			—

	$	348,986		$	251,500

Derivative liabilities:
Natural gas – swaps	$	269		$	—
– collars		(1,112	)		—
NGLs – C5 swaps		(3,232	)		(173	)
– C3 swaps		(1,613	)		—

	$	(5,688	)	$	(173	)

The table below provides data about the fair value of our derivative contracts. 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 (in thousands):


	June 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)	$	65,114	$	(7,464	)	$	57,650		$	54,318	$	(419	)	$	53,899
Collars ^(a)		221,540		(6,294	)		215,246			228,228		(1,954	)		226,274
Put options ^(a)		1,071		—			1,071			—		—			—

	$	287,725	$	(13,758	)	$	273,967		$	282,546	$	(2,373	)	$	280,173


Derivatives that do not qualify for hedge accounting:
Sold swaps ^(a)	$	87,262	$	(3,342	)	$	83,920		$	17,949	$	(2,794	)	$	15,155
Purchased swaps ^(a)		1,506		(8,447	)		(6,941	)		—		—			—
Collars ^(a)		—		(2,925	)		(2,925	)		—		(14,653	)		(14,653	)
Call options ^(a)		—		(4,723	)		(4,723	)		—		(29,348	)		(29,348	)

	$	88,768	$	(19,437	)	$	69,331		$	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:


	Three Months Ended June 30,												Six Months Ended June 30,
	Change in Hedge Derivative Fair Value						Realized Gain Reclassified from OCI into Revenue ^(a)						Change in Hedge Derivative Fair Value						Realized Gain Reclassified from OCI into Revenue ^(a)
	2012			2011			2012			2011			2012			2011			2012			2011

Swaps	$	19,665		$	4,655		$	32,334		$	—		$	55,836		$	2,115		$	51,647		$	—
Put options		648			—			(315	)		—			(914	)		—			(315	)		—
Collars		(12,423	)		23,223			46,561			24,285			84,048			22,424			84,878			53,902
Collars – discontinued operations		—			—			—			—			—			412			—			8,607
Income taxes		(3,077	)		(10,454	)		(30,646	)		(9,107	)		(55,183	)		(7,414	)		(52,834	)		(23,441	)

	$	4,813		$	17,424		$	47,934		$	15,178		$	83,787		$	17,537		$	83,376		$	39,068

^(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:


	Three Months Ended June 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	$	129,313		$	15,613	$	562	$	—	$	129,875		$	15,613
Purchased swaps		(8,744	)		—		—		—		(8,744	)		—
Collars		14,894			6,452		1,310		7,510		16,204			13,962
Call options		11,234			23,464		—		—		11,234			23,464

Total	$	146,697		$	45,529	$	1,872	$	7,510	$	148,569		$	53,039


	Six Months Ended June 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	$	76,328		$	13,750		$	666	$	—	$	76,994		$	13,750
Purchased swaps		(8,744	)		—			—		—		(8,744	)		—
Collars		12,392			(1,135	)		1,443		9,024		13,835			7,889
Call options		5,651			(9,391	)		—		—		5,651			(9,391	)
Basis swaps		—			(43)			—		—		—			(43)
Total	$	85,627		$	3,181		$	2,109	$	9,024	$	87,736		$	12,205

- 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

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-Publisher FASB
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Reference 18: http://www.xbrl.org/2003/role/presentationRef
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Reference 20: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-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 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44
-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

6 Months Ended

Jun. 30, 2012

Fair Value Measurements [Abstract]

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 June 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 June 30, 2012

Trading securities held in the deferred compensation plans	$	56,345	$	—		$	—	$	56,345

Derivatives – swaps		—		134,629			—		134,629
– collars		—		212,320			—		212,320
– call options		—		(4,722	)		—		(4,722	)
– put options		—		1,071			—		1,071


	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/losses are included in deferred compensation plan expense in the accompanying statement of operations. For second quarter 2012, interest and dividends were $125,000 and mark-to-market was a loss of $2.1 million. For second quarter 2011, interest and dividends were $60,000 and the mark-to-market was a gain of $5,000. For the six months ended June 30, 2012, interest and dividends were $275,000 and mark-to-market was a gain of $1.9 million. For the six months ended June 30, 2011, interest and dividends were $95,000 and mark-to-market was a gain of $1.3 million.

Fair Values – Reported

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


	June 30, 2012						December 31, 2011
	Carrying Value			Fair Value			Carrying Value			Fair Value
Assets:
Commodity swaps, collars, call and put options	$	348,986		$	348,986		$	251,500		$	251,500
Marketable securities^(a)		56,345			56,345			50,237			50,237

Liabilities:
Commodity swaps, collars, call and put options		(5,688	)		(5,688	)		(173	)		(173	)
Bank credit facility^(b)		(235,000	)		(235,000	)		(187,000	)		(187,000	)
7.50% senior subordinated notes due 2017^(b)		(250,000	)		(261,250	)		(250,000	)		(265,625	)
7.25% senior subordinated notes due 2018^(b)		(250,000	)		(265,000	)		(250,000	)		(267,500	)
8.00% senior subordinated notes due 2019^(b)		(288,562	)		(327,750	)		(287,967	)		(334,500	)
6.75% senior subordinated notes due 2020^(b)		(500,000	)		(542,500	)		(500,000	)		(555,000	)
5.75% senior subordinated notes due 2021^(b)		(500,000	)		(522,500	)		(500,000	)		(541,250	)
5.00% senior subordinated notes due 2022^(b)		(600,000	)		(592,500	)		—			—

^(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 June 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 $2.8 million at June 30, 2012 compared to $4.0 million at December 31, 2011. As of June 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 June 30, 2012 our derivative counterparties include sixteen financial institutions, of which all but two are secured lenders in our bank credit facility. At June 30, 2012, our net derivative assets include a receivable from the two counterparties not included in our bank credit facility of $26.5 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
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 825
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13504-108611

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, 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 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-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 Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-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 107
-Paragraph 15A
-Subparagraph a-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 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
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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 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-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 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-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

6 Months Ended

Jun. 30, 2012

Stock-Based Compensation Plans [Abstract]

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 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 second quarter 2012, stock-based compensation was allocated to operating expense ($692,000), exploration expense ($994,000) and general and administrative expense ($12.5 million) for a total of $14.6 million. In second quarter 2011, stock-based compensation was allocated to operating expense ($643,000), exploration expense ($937,000) and general and administrative expense ($11.5 million) for a total of $13.4 million. In the first six months ended June 30, 2012, stock-based compensation was allocated to operating expense ($1.0 million), exploration expense ($1.9 million) and general and administrative expense ($20.7 million) for a total of $24.5 million. In the first six months ended June 30, 2011, stock-based compensation was allocated to operating expense ($953,000), exploration expense ($2.3 million) and general and administrative expense ($19.0 million) for a total of $22.9 million. Unlike the other forms of stock-based compensation mentioned above, the mark-to-market 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 4.1 million grants outstanding at June 30, 2012, 32,000 of the grants relate to stock options with the remainder of 4.0 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		(1,218,780	)		21.90
Expired/forfeited		(6,196	)		48.31

Outstanding at June 30, 2012		4,088,104		$	51.48

Stock Appreciation Right Awards

During first six 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:


	Six Months Ended June 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		0.4	%
Weighted average grant date fair value	$	21.32

Restricted Stock Awards

Equity Awards

In the first six months ended June 30, 2012, we granted 360,000 restricted stock Equity Awards to employees compared to 329,000 granted to employees in the same period of 2011. These awards generally vest over a three-year period. We recorded compensation expense for these awards of $5.2 million in first six months ended June 30, 2012 compared to $1.7 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 six months 2012, we granted 355,400 shares of restricted stock Liability Awards as compensation to employees at an average price of $63.87 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 334,000 shares of Liability Awards as compensation to employees at an average price of $51.10 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 $10.2 million in first six months ended June 30, 2012 compared to $10.4 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 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 June 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		370,059			63.89
Vested		(85,294	)		56.87		(227,844	)		50.51
Forfeited		(14,307	)		57.56		(1,717	)		51.39

Outstanding at June 30, 2012		481,740		$	58.37		627,742		$	57.04

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 $9.3 million in second quarter 2012 compared to mark-to-market gain of $5.8 million in second quarter 2011. We recorded mark-to-market loss of $1.5 million in the first six months June 30, 2012 compared to mark-to-market loss of $24.9 million in the same period of 2011. The Rabbi Trust held 3.0 million shares (2.3 million of vested shares) of Range stock at June 30, 2012 compared to 2.8 million shares (2.2 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
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-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

6 Months Ended

Jun. 30, 2012

Supplemental Cash Flow Elements [Abstract]

SUPPLEMENTAL CASH FLOW INFORMATION

(15)

SUPPLEMENTAL CASH FLOW INFORMATION


	Six Months Ended June 30,
	2012		2011
	(in thousands)
Net cash provided from operating activities included:
Income taxes paid to taxing authorities	$	246	$	308
Interest paid		66,438		68,002

Non-cash investing and financing activities included:
Asset retirement costs capitalized, net		4,004		12,717

Commitments and Contingencies

6 Months Ended

Jun. 30, 2012

Commitments and Contingencies [Abstract]

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.

- 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

6 Months Ended

Jun. 30, 2012

Suspended Exploratory Well Costs/Capitalized Costs and Accumulated Depreciation, Depletion and Amortization/Costs Incurred for Property Acquisition, Exploration and Development [Abstract]

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization

(17)

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


	June 30, 2012		December 31, 2011
	(in thousands)
Natural gas and oil properties:
Properties subject to depletion	$	6,779,021	$	6,035,429
Unproved properties		817,409		748,598

Total		7,596,430		6,784,027
Accumulated depreciation, depletion and amortization		(1,825,390)		(1,626,461)

Net capitalized costs	$	5,771,040	$	5,157,566

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

Costs Incurred for Property Acquisition, Exploration and Development

6 Months Ended

Jun. 30, 2012

Suspended Exploratory Well Costs/Capitalized Costs and Accumulated Depreciation, Depletion and Amortization/Costs Incurred for Property Acquisition, Exploration and Development [Abstract]

Cost incurred for property acquisition, exploration and development activities

(18)

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


	Six Months Ended June 30, 2012		Twelve Months Ended December 31, 2011
Acreage purchases	$	151,622	$	220,576
Development		539,122		1,007,049
Exploration:
Drilling		185,081		226,920
Expense		35,112		77,259
Stock-based compensation expense		1,921		4,108
Gas gathering facilities:
Development		23,684		53,387

Subtotal		936,542		1,589,299

Asset retirement obligations		4,004		24,061


Total – continuing operations		940,546		1,613,360
Discontinued operations		—		3,241

Total costs incurred	$	940,546	$	1,616,601

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

New Accounting Standards (Policies)	6 Months Ended
New Accounting Standards (Policies)	Jun. 30, 2012
New Accounting Standards [Abstract]
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)

6 Months Ended

Jun. 30, 2012

Discontinued Operations [Abstract]

Components of discontinued operations


	Three Months Ended June 30, 2011		Six Months Ended June 30, 2011
Revenues and other income:
Natural gas, NGLs and oil sales	$	12,751	$	57,324
Other		1		10
Gain on the sale of assets		3,820		3,820

Total revenues and other income		16,572		61,154


Costs and expenses:
Direct operating		2,169		10,446
Transportation, gathering and compression		1,974		4,290
Production and ad valorem taxes		184		1,250
Exploration expense		5		37
Interest expense ^(a)		3,715		14,791
Depletion, depreciation and amortization		14		8,894

Total costs and expenses		8,061		39,708


Income before income taxes		8,511		21,446

Income tax expense
Current		—		—
Deferred		2,994		7,531

		2,994		7,531


Net income from discontinued operations	$	5,517	$	13,915

^(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


	December 31, 2011

Composition of liabilities of discontinued operations:
Accrued liabilities	$	653

Total current liabilities of discontinued operations	$	653

Income Taxes (Tables)

6 Months Ended

Jun. 30, 2012

Income Taxes [Abstract]

Income tax expense from continuing operations


	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011

Income tax expense	$	39,007		$	32,703		$	11,164		$	12,806
Effective tax rate		41.2	%		41.7	%		44.6	%		50.9	%

Income Per Common Share (Tables)

6 Months Ended

Jun. 30, 2012

Income (Loss) Per Common Share [Abstract]

Computations of basic and diluted (loss) income per common share


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

Income as reported	$	55,676		$	—	$	55,676		$	45,776		$	5,517		$	51,293
Participating basic earnings ^(a)		(999	)		—		(999	)		(808	)		(97	)		(905	)

Basic income attributed to common shareholders		54,677			—		54,677			44,968			5,420			50,388
Reallocation of participating earnings ^(a)		3			—		3			4			1			5

Diluted income attributed to common shareholders	$	54,680		$	—	$	54,680		$	44,972		$	5,421		$	50,393


Income per common share:
Basic	$	0.34		$	—	$	0.34		$	0.28		$	0.04		$	0.32
Diluted	$	0.34		$	—	$	0.34		$	0.28		$	0.04		$	0.32

^(a)


	Six Months Ended June 30, 2012								Six Months Ended June 30, 2011
	Continuing Operations			Discontinued Operations		Total			Continuing Operations			Discontinued Operations			Total

Income as reported	$	13,876		$	—	$	13,876		$	12,345		$	13,915		$	26,260
Participating basic earnings ^(a)		(246	)		—		(246	)		(220	)		(248	)		(468	)

Basic income attributed to common shareholders		13,630			—		13,630			12,125			13,667			25,792
Reallocation of participating earnings ^(a)		—			—		—			—			1			1

Diluted income attributed to common shareholders	$	13,630		$	—	$	13,630		$	12,125		$	13,668		$	25,793


Income per common share:
Basic	$	0.09		$	—	$	0.09		$	0.08		$	0.08		$	0.16
Diluted	$	0.09		$	—	$	0.09		$	0.08		$	0.08		$	0.16

^(a)

Basic weighted average common shares outstanding to diluted weighted average common shares outstanding


	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Denominator:
Weighted average common shares outstanding – basic		159,412		157,997		159,162		157,772
Effect of dilutive securities:
Director and employee stock options and SARs		618		836		787		957

Weighted average common shares outstanding – diluted		160,030		158,833		159,949		158,729

Suspended Exploratory Well Costs (Tables)

6 Months Ended

Jun. 30, 2012

Suspended Exploratory Well Costs/Capitalized Costs and Accumulated Depreciation, Depletion and Amortization/Costs Incurred for Property Acquisition, Exploration and Development [Abstract]

Suspended Exploratory Well Costs


	June 30, 2012			December 31, 2011

Balance at beginning of period	$	93,388		$	23,908
Additions to capitalized exploratory well costs pending the determination of proved reserves		150,136			86,996
Reclassifications to wells, facilities and equipment based on determination of proved reserves		(178,423	)		(17,516	)
Divested wells		(4,980	)		—
Capitalized exploratory well costs charged to expense		—			—

Balance at end of period		60,121			93,388
Less exploratory well costs that have been capitalized for a period of one year or less		(39,107	)		(83,860	)

Capitalized exploratory well costs that have been capitalized for a period greater than one year	$	21,014		$	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 that have been suspended for more than one year


	Total		2012		2011		2010		2009		2008

Capitalized exploratory well costs that have been capitalized for more than one year	$	21,014	$	6,933	$	9,602	$	72	$	2,884	$	1,523

Indebtedness (Tables)

6 Months Ended

Jun. 30, 2012

Indebtedness [Abstract]

Debt Outstanding


	June 30, 2012		December 31, 2011

Bank debt (2.2%)	$	235,000	$	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 $11,438 and $12,033 discount, respectively		288,562		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	$	2,623,562	$	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
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-Section 55
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-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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

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Reference 9: 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=6451184&loc=d3e28551-108399

Reference 10: 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=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)

6 Months Ended

Jun. 30, 2012

Asset Retirement Obligation [Abstract]

Asset Retirement Obligations


	Six Months Ended June 30, 2012

Beginning of period	$	84,810
Liabilities incurred		4,009
Liabilities settled		(2,142	)
Disposition of wells		(151	)
Accretion expense		3,668
Change in estimate		(5	)

End of period		90,189

Less current portion		(5,005	)


Long-term asset retirement obligations	$	85,184

Capital Stock (Tables)

6 Months Ended

Jun. 30, 2012

Capital Stock [Abstract]

Capital Stock


	Six Months Ended June 30, 2012		Year Ended December 31, 2011

Beginning balance		161,131,547		159,909,052
Stock options/SARs exercised		773,299		862,774
Restricted stock grants		354,674		326,591
Restricted stock units vested		52,417		—
Treasury shares		17,620		33,130

Ending balance		162,329,557		161,131,547

Derivative Activities (Tables)

6 Months Ended

Jun. 30, 2012

Derivative Activities [Abstract]

Derivative volumes hedged and average hedge prices


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	245,000 Mmbtu/day	$ 3.74–$ 4.50
2012	Swaps	245,000 Mmbtu/day	$3.75
2013	Swaps	167,521 Mmbtu/day	$3.56

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 Option	2,500 bbls/day	$80.00
2013	Swaps	6,313 bbls/day	$96.49
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 loss


	Three Months Ended June 30,					Six Months Ended June 30,
	2012		2011			2012			2011

Change in fair value of derivatives that do not qualify for hedge accounting ^(a)	$	135,777	$	48,139		$	83,721		$	8,103
Realized gain (loss) on settlement – natural gas ^(a) ^(b)		—		3,484			—			3,090
Realized gain (loss) on settlement – oil ^{(a) (b)}		768		(6,094	)		(3,854	)		(8,012	)
Realized gain (loss) on settlement – NGLs ^{(a) (b)}		10,152		—			5,760			—
Hedge ineffectiveness – realized		1,278		1,576			2,463			2,522
– unrealized		594		5,934			(354	)		6,502

Derivative fair value income	$	148,569	$	53,039		$	87,736		$	12,205

^(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 sheet


	June 30, 2012			December 31, 2011

Derivative assets:
Natural gas – swaps	$	33,637		$	54,162
– collars		208,178			228,228
Crude oil – swaps		23,744			(263	)
– collars		5,254			(16,607	)
– call options		(4,723	)		(29,348	)
– put options		1,071			—
NGLs – C5 swaps		79,492			15,328
– C3 swaps		2,333			—

	$	348,986		$	251,500

Derivative liabilities:
Natural gas – swaps	$	269		$	—
– collars		(1,112	)		—
NGLs – C5 swaps		(3,232	)		(173	)
– C3 swaps		(1,613	)		—

	$	(5,688	)	$	(173	)

Derivative Gross Assets and Gross Liabilities


	June 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)	$	65,114	$	(7,464	)	$	57,650		$	54,318	$	(419	)	$	53,899
Collars ^(a)		221,540		(6,294	)		215,246			228,228		(1,954	)		226,274
Put options ^(a)		1,071		—			1,071			—		—			—

	$	287,725	$	(13,758	)	$	273,967		$	282,546	$	(2,373	)	$	280,173


Derivatives that do not qualify for hedge accounting:
Sold swaps ^(a)	$	87,262	$	(3,342	)	$	83,920		$	17,949	$	(2,794	)	$	15,155
Purchased swaps ^(a)		1,506		(8,447	)		(6,941	)		—		—			—
Collars ^(a)		—		(2,925	)		(2,925	)		—		(14,653	)		(14,653	)
Call options ^(a)		—		(4,723	)		(4,723	)		—		(29,348	)		(29,348	)

	$	88,768	$	(19,437	)	$	69,331		$	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 (loss)


	Three Months Ended June 30,												Six Months Ended June 30,
	Change in Hedge Derivative Fair Value						Realized Gain Reclassified from OCI into Revenue ^(a)						Change in Hedge Derivative Fair Value						Realized Gain Reclassified from OCI into Revenue ^(a)
	2012			2011			2012			2011			2012			2011			2012			2011

Swaps	$	19,665		$	4,655		$	32,334		$	—		$	55,836		$	2,115		$	51,647		$	—
Put options		648			—			(315	)		—			(914	)		—			(315	)		—
Collars		(12,423	)		23,223			46,561			24,285			84,048			22,424			84,878			53,902
Collars – discontinued operations		—			—			—			—			—			412			—			8,607
Income taxes		(3,077	)		(10,454	)		(30,646	)		(9,107	)		(55,183	)		(7,414	)		(52,834	)		(23,441	)

	$	4,813		$	17,424		$	47,934		$	15,178		$	83,787		$	17,537		$	83,376		$	39,068

^(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 statement of operations


	Three Months Ended June 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	$	129,313		$	15,613	$	562	$	—	$	129,875		$	15,613
Purchased swaps		(8,744	)		—		—		—		(8,744	)		—
Collars		14,894			6,452		1,310		7,510		16,204			13,962
Call options		11,234			23,464		—		—		11,234			23,464

Total	$	146,697		$	45,529	$	1,872	$	7,510	$	148,569		$	53,039


	Six Months Ended June 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	$	76,328		$	13,750		$	666	$	—	$	76,994		$	13,750
Purchased swaps		(8,744	)		—			—		—		(8,744	)		—
Collars		12,392			(1,135	)		1,443		9,024		13,835			7,889
Call options		5,651			(9,391	)		—		—		5,651			(9,391	)
Basis swaps		—			(43)			—		—		—			(43)
Total	$	85,627		$	3,181		$	2,109	$	9,024	$	87,736		$	12,205

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value Measurements [Abstract]

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


	Fair Value Measurements at June 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 June 30, 2012

Trading securities held in the deferred compensation plans	$	56,345	$	—		$	—	$	56,345

Derivatives – swaps		—		134,629			—		134,629
– collars		—		212,320			—		212,320
– call options		—		(4,722	)		—		(4,722	)
– put options		—		1,071			—		1,071


	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	)

Carrying amounts and Fair values of Financial Instruments


	June 30, 2012						December 31, 2011
	Carrying Value			Fair Value			Carrying Value			Fair Value
Assets:
Commodity swaps, collars, call and put options	$	348,986		$	348,986		$	251,500		$	251,500
Marketable securities^(a)		56,345			56,345			50,237			50,237

Liabilities:
Commodity swaps, collars, call and put options		(5,688	)		(5,688	)		(173	)		(173	)
Bank credit facility^(b)		(235,000	)		(235,000	)		(187,000	)		(187,000	)
7.50% senior subordinated notes due 2017^(b)		(250,000	)		(261,250	)		(250,000	)		(265,625	)
7.25% senior subordinated notes due 2018^(b)		(250,000	)		(265,000	)		(250,000	)		(267,500	)
8.00% senior subordinated notes due 2019^(b)		(288,562	)		(327,750	)		(287,967	)		(334,500	)
6.75% senior subordinated notes due 2020^(b)		(500,000	)		(542,500	)		(500,000	)		(555,000	)
5.75% senior subordinated notes due 2021^(b)		(500,000	)		(522,500	)		(500,000	)		(541,250	)
5.00% senior subordinated notes due 2022^(b)		(600,000	)		(592,500	)		—			—

^(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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

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
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 14
-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.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-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
-Publisher FASB
-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)

6 Months Ended

Jun. 30, 2012

Stock-Based Compensation Plans [Abstract]

Stock option and SARs activities


	Shares			Weighted Average Exercise Price

Outstanding at December 31, 2011		4,558,609		$	41.47
Granted		754,471			64.14
Exercised		(1,218,780	)		21.90
Expired/forfeited		(6,196	)		48.31

Outstanding at June 30, 2012		4,088,104		$	51.48

Weighted average grant date fair value of SARs


	Six Months Ended June 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		0.4	%
Weighted average grant date fair value	$	21.32

Non-vested restricted stock outstanding


	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		370,059			63.89
Vested		(85,294	)		56.87		(227,844	)		50.51
Forfeited		(14,307	)		57.56		(1,717	)		51.39

Outstanding at June 30, 2012		481,740		$	58.37		627,742		$	57.04

Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2012

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information


	Six Months Ended June 30,
	2012		2011
	(in thousands)
Net cash provided from operating activities included:
Income taxes paid to taxing authorities	$	246	$	308
Interest paid		66,438		68,002

Non-cash investing and financing activities included:
Asset retirement costs capitalized, net		4,004		12,717

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

6 Months Ended

Jun. 30, 2012

Suspended Exploratory Well Costs/Capitalized Costs and Accumulated Depreciation, Depletion and Amortization/Costs Incurred for Property Acquisition, Exploration and Development [Abstract]

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization


	June 30, 2012		December 31, 2011
	(in thousands)
Natural gas and oil properties:
Properties subject to depletion	$	6,779,021	$	6,035,429
Unproved properties		817,409		748,598

Total		7,596,430		6,784,027
Accumulated depreciation, depletion and amortization		(1,825,390)		(1,626,461)

Net capitalized costs	$	5,771,040	$	5,157,566

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

6 Months Ended

Jun. 30, 2012

Suspended Exploratory Well Costs/Capitalized Costs and Accumulated Depreciation, Depletion and Amortization/Costs Incurred for Property Acquisition, Exploration and Development [Abstract]

Costs Incurred for Property Acquisition, Exploration and Development


	Six Months Ended June 30, 2012		Twelve Months Ended December 31, 2011
Acreage purchases	$	151,622	$	220,576
Development		539,122		1,007,049
Exploration:
Drilling		185,081		226,920
Expense		35,112		77,259
Stock-based compensation expense		1,921		4,108
Gas gathering facilities:
Development		23,684		53,387

Subtotal		936,542		1,589,299

Asset retirement obligations		4,004		24,061


Total – continuing operations		940,546		1,613,360
Discontinued operations		—		3,241

Total costs incurred	$	940,546	$	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 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Basis of Presentation (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Abandonment and impairment of unproved properties	$ 43,641	$ 18,900	$ 63,930	$ 35,437
Basis of Presentation (Textual) [Abstract]
Impact fee			$ 24,700
Period related to annual impact fee per well drilled			15 years
PA unproved impairment [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Abandonment and impairment of unproved properties			$ 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 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
Dispositions (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Dispositions and Acquisitions (Textual) [Abstract]
Proceeds from sale of oil and gas properties			$ 15,620	$ 23,409
Loss on sale of oil and gas properties			(13,653)	(1,483)
Barnett Shale Properties [Member]
Dispositions and Acquisitions (Textual) [Abstract]
Proceeds from the sale of natural gas properties					$ 889,300
Loss on derivative contracts				$ (1,700)
East Texas [Member]
Dispositions and Acquisitions (Textual) [Abstract]
Proceeds from sale of oil and gas properties	$ 8,600
Loss on sale of oil and gas properties	$ (10,900)
Sale of oil and gas properties	75.00%
Overriding royalty in the prospect minimum	2.50%
Overriding royalty in the prospect maximum	5.00%
Low pressure pipeline [Member]
Dispositions and Acquisitions (Textual) [Abstract]
Proceeds from sale of pipeline		$ 14,700
Gain from sale of pipeline		$ 0
Marcellus Shale Properties [Member]
Dispositions and Acquisitions (Textual) [Abstract]
Proceeds from sale of oil and gas properties			2,500
Loss on sale of oil and gas properties			$ (2,500)

Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Discontinued Operations (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues and other income:
Natural gas, NGLs and oil sales	$ 298,349	$ 285,353	$ 615,966	$ 537,316
Other	(1,251)	(1,475)	(716)	(85)
Gain on the sale of assets	(3,227)	(1,622)	(13,653)	(1,483)
Total revenues and other income	442,440	335,295	689,333	547,953
Costs and expenses:
Direct operating	27,041	28,509	56,063	57,226
Transportation, gathering and compression	44,744	28,666	85,564	53,748
Production and ad valorem taxes	11,786	7,550	48,420	14,429
Exploration expense	15,517	11,592	37,033	38,779
Interest expense	42,888	31,383	80,093	56,162
Depletion, depreciation and amortization	108,802	78,294	208,953	150,510
Total costs and expenses	347,757	256,816	664,293	522,802
Income tax expense
Current		8		8
Deferred	39,007	32,695	11,164	12,798
Total income tax expense	$ 39,007	32,703	$ 11,164	12,806
Net income from discontinued operations		5,517		13,915
Discontinued operations [Member]
Revenues and other income:
Natural gas, NGLs and oil sales		12,751		57,324
Other		1		10
Gain on the sale of assets		3,820		3,820
Total revenues and other income		16,572		61,154
Costs and expenses:
Direct operating		2,169		10,446
Transportation, gathering and compression		1,974		4,290
Production and ad valorem taxes		184		1,250
Exploration expense		5		37
Interest expense		3,715		14,791
Depletion, depreciation and amortization		14		8,894
Total costs and expenses		8,061		39,708
Income before income taxes		8,511		21,446
Income tax expense
Current
Deferred		2,994		7,531
Total income tax expense		2,994		7,531
Net income from discontinued operations		$ 5,517		$ 13,915

Discontinued Operations (Details 1) $ in Thousands	Dec. 31, 2011 USD ($)
Composition of liabilities of discontinued operations:
Accrued liabilities	$ 653
Total current liabilities of discontinued operations	$ 653

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income tax expense
Income tax expense	$ 39,007	$ 32,703	$ 11,164	$ 12,806
Effective tax rate	41.20%	41.70%	44.60%	50.90%
Income Taxes (Textual) [Abstract]
Statutory Tax Rate	35.00%	35.00%	35.00%	35.00%

Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Computations of basic and diluted (loss) income per common share
Income as reported	$ 55,676	$ 51,293	$ 13,876	$ 26,260
Participating basic earnings	(999)	(905)	(246)	(468)
Basic income attributed to common shareholders	54,677	50,388	13,630	25,792
Reallocation of participating earnings	3	5	0	1
Diluted income attributed to common shareholders	$ 54,680	$ 50,393	$ 13,630	$ 25,793
Income per common share:
Basic	$ 0.34	$ 0.32	$ 0.09	$ 0.16
Diluted	$ 0.34	$ 0.32	$ 0.09	$ 0.16
Denominator:
Weighted average common shares outstanding - basic	159,412	157,997	159,162	157,772
Effect of dilutive securities:
Director and employee stock options and SARs	618	836	787	957
Weighted average common shares outstanding - diluted	160,030	158,833	159,949	158,729
Continuing operations [Member]
Computations of basic and diluted (loss) income per common share
Income as reported	$ 55,676	$ 45,776	$ 13,876	$ 12,345
Participating basic earnings	(999)	(808)	(246)	(220)
Basic income attributed to common shareholders	54,677	44,968	13,630	12,125
Reallocation of participating earnings	3	4	0	0
Diluted income attributed to common shareholders	$ 54,680	$ 44,972	$ 13,630	$ 12,125
Income per common share:
Basic	$ 0.34	$ 0.28	$ 0.09	$ 0.08
Diluted	$ 0.34	$ 0.28	$ 0.09	$ 0.08
Discontinued operations [Member]
Computations of basic and diluted (loss) income per common share
Income as reported	$ 0	$ 5,517	$ 0	$ 13,915
Participating basic earnings	0	(97)	0	(248)
Basic income attributed to common shareholders	0	5,420	0	13,667
Reallocation of participating earnings	0	1	0	1
Diluted income attributed to common shareholders	$ 0	$ 5,421	$ 0	$ 13,668
Income per common share:
Basic	$ 0.00	$ 0.04	$ 0.00	$ 0.08
Diluted	$ 0.00	$ 0.04	$ 0.00	$ 0.08

Income Per Common Share (Details Textual) - shares	3 Months Ended		6 Months Ended
Income Per Common Share (Details Textual) - shares	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income from Continuing Operations Per Common Share (Textual) [Abstract]
Weighted Average Number of Shares, Restricted Stock Liability Awards	2,900,000	2,800,000	2,900,000	2,900,000
Stock appreciation rights excluded from earning per share calculation	761,000	860,000	592,000	1,000,000

- 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 (Details) $ in Thousands	6 Months Ended	12 Months Ended
Suspended Exploratory Well Costs (Details) $ in Thousands	Jun. 30, 2012 USD ($) Project	Dec. 31, 2011 USD ($) Project
Suspended Exploratory Well Costs
Balance at beginning of period	$ 93,388	$ 23,908
Additions to capitalized exploratory well costs pending the determination of proved reserves	150,136	86,996
Reclassifications to wells, facilities and equipment based on determination of proved reserves	(178,423)	(17,516)
Divested wells	(4,980)
Capitalized exploratory well costs charged to expense
Balance at end of period	60,121	93,388
Less exploratory well costs that have been capitalized for a period of one year or less	(39,107)	(83,860)
Capitalized exploratory well costs that have been capitalized for a period greater than one year	$ 21,014	$ 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 (Details 1) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Aging of capitalized exploratory well costs that have been suspended for more than one year
Capitalized exploratory well costs that have been capitalized for more than one year	$ 21,014	$ 9,528
Exploratory well costs capitalized in year 2012 [Member]
Aging of capitalized exploratory well costs that have been suspended for more than one year
Capitalized exploratory well costs that have been capitalized for more than one year	6,933
Exploratory well costs capitalized in year 2011 [Member]
Aging of capitalized exploratory well costs that have been suspended for more than one year
Capitalized exploratory well costs that have been capitalized for more than one year	9,602
Exploratory well costs capitalized in year 2010 [Member]
Aging of capitalized exploratory well costs that have been suspended for more than one year
Capitalized exploratory well costs that have been capitalized for more than one year	72
Exploratory well costs capitalized in year 2009 [Member]
Aging of capitalized exploratory well costs that have been suspended for more than one year
Capitalized exploratory well costs that have been capitalized for more than one year	2,884
Exploratory well costs capitalized in year 2008 [Member]
Aging of capitalized exploratory well costs that have been suspended for more than one year
Capitalized exploratory well costs that have been capitalized for more than one year	$ 1,523

Suspended Exploratory Well Costs (Details Textual) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2012	Jun. 30, 2012 USD ($) Well	Dec. 31, 2011 USD ($)
Suspended Exploratory Well Costs (Textual) [Abstract]
Capitalized exploratory well costs that have been capitalized for more than one year \| $		$ 21,014	$ 9,528
Number of wells located in the Marcellus Shale area		7
Number of wells in the completion stage		3
Number of wells waiting on pipeline		5
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%

Indebtedness (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Indebtedness
Bank debt	$ 235,000	$ 187,000
Senior subordinated notes:
Subordinated debt	2,388,562	1,787,967
Total debt	2,623,562	1,974,967
7.50% Senior Subordinated notes due 2017 [Member]
Senior subordinated notes:
Subordinated debt	250,000	250,000
7.25% Senior Subordinated notes due 2018 [Member]
Senior subordinated notes:
Subordinated debt	250,000	250,000
8.00% senior subordinated notes due 2019, net of discount [Member]
Senior subordinated notes:
Subordinated debt	288,562	287,967
6.75% Senior Subordinated notes due 2020 [Member]
Senior subordinated notes:
Subordinated debt	500,000	500,000
5.75% Senior Subordinated notes due 2021 [Member]
Senior subordinated notes:
Subordinated debt	500,000	$ 500,000
5.00% Senior Subordinated notes due 2022 [Member]
Senior subordinated notes:
Subordinated debt	$ 600,000

Indebtedness (Details Textual) $ in Thousands	1 Months Ended	3 Months Ended			6 Months Ended
Indebtedness (Details Textual) $ in Thousands	Apr. 30, 2012 CommercialBank	Jun. 30, 2012 USD ($) CommercialBank	Mar. 31, 2012 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2012 USD ($) CommercialBank	Jun. 30, 2011 USD ($)	Feb. 15, 2020	Feb. 15, 2017	Dec. 31, 2011 USD ($)
Debt Instrument [Line Items]
Net proceeds after underwriting discounts and commissions					$ 600,000	$ 500,000
Proceeds to pay down our outstanding credit facility balance					$ 649,000	764,826
Purchase price of senior subordinate notes as a percentage of principal		101.00%			101.00%
Indebtedness (Textual) [Abstract]
Interest costs, capitalized during period		$ 0		$ 0	$ 0	$ 0
Bank Credit facility, Borrowing base		2,000,000			2,000,000
Bank Credit facility, Facility amount		$ 1,750,000			$ 1,750,000
Number of commercial banks included in current bank group \| CommercialBank		28			28
Number of commercial banks added to bank group \| CommercialBank	3
Percentage holding of commercial banks, Maximum		9.00%			9.00%
Notice period for increase in facility amount					20 days
Outstanding balance under the bank credit facility		$ 235,000			$ 235,000				$ 187,000
Undrawn letters of credit		62,100			$ 62,100
Maturity date of loan					Feb. 18, 2016
Borrowing capacity available under the facility amount		$ 1,500,000			$ 1,500,000
Weighted average interest rate on the bank credit facility		2.70%		2.00%	2.30%	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%
Bank debt percentage		2.20%			2.20%				2.20%
Maximum [Member]
Line of Credit Facility [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%
Ratio of debt to EBITDAX		4.25			4.25
Current ratio		1.0			1.0
Minimum [Member]
Line of Credit Facility [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%
Ratio of debt to EBITDAX		1.0			1.0
Current ratio		1.0			1.0
7.50% Senior Subordinated notes due 2017 [Member]
Debt Instrument [Line Items]
Interest rate on senior subordinated notes		7.50%			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%				7.25%
8.00% senior subordinated notes due 2019, net of discount [Member]
Debt Instrument [Line Items]
Discount on Senior Subordinated notes		$ 11,438			$ 11,438				$ 12,033
Interest rate on senior subordinated notes		8.00%			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%				6.75%
5.75% Senior Subordinated notes due 2021 [Member]
Debt Instrument [Line Items]
Interest rate on senior subordinated notes		5.75%			5.75%				5.75%
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%
Aggregate principal amount of senior subordinated notes			600,000
Net proceeds after underwriting discounts and commissions			589,500
Maximum redemption price of notes as percentage of principal amount		105.00%			105.00%		100.00%	102.50%
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%
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

Asset Retirement Obligations (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Asset Retirement Obligations
Beginning of period	$ 84,810
Liabilities incurred	4,009
Liabilities settled	(2,142)
Disposition of wells	(151)
Accretion expense	3,668
Change in estimate	(5)
End of period	90,189
Less current portion	(5,005)	$ (5,005)
Long-term asset retirement obligations	$ 85,184

Capital Stock (Details) - shares	6 Months Ended	12 Months Ended
Capital Stock (Details) - shares	Jun. 30, 2012	Dec. 31, 2011
Capital Stock
Beginning balance	161,131,547	159,909,052
Stock options/SARs exercised	773,299	862,774
Restricted stock grants	354,674	326,591
Restricted stock units vested	52,417
Treasury shares	17,620	33,130
Ending balance	162,329,557	161,131,547

Capital Stock (Details Textual) - shares	Jun. 30, 2012	Dec. 31, 2011
Capital Stock (Textual) [Abstract]
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

Derivative Activities (Details)	Jun. 30, 2012 MmbtuPerDay BblsPerDay Bcf MMBbls $ / DerivativePrice
Natural Gas [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| Bcf	106.2
Average hedge price	3.64
NGLs (Natural Gasoline) [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| MMBbls	3.6
Average hedge price	97.85
Collars [Member] \| Crude Oil 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| BblsPerDay	2,000
Average floor price	70.00
Average cap price	80.00
Collars [Member] \| Crude Oil 2013 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| BblsPerDay	3,000
Average floor price	90.60
Average cap price	100.00
Collars [Member] \| Crude Oil 2014 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| BblsPerDay	2,000
Average floor price	85.55
Average cap price	100.00
Collars [Member] \| Natural Gas 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| MmbtuPerDay	279,641
Average floor price	4.76
Average cap price	5.22
Collars [Member] \| Natural Gas 2013 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| MmbtuPerDay	240,000
Average floor price	4.73
Average cap price	5.20
Collars [Member] \| Natural Gas 2014 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| MmbtuPerDay	245,000
Average floor price	3.74
Average cap price	4.50
Swap [Member] \| Crude Oil 2013 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| BblsPerDay	6,313
Average hedge price	96.49
Swap [Member] \| Crude Oil 2014 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| BblsPerDay	4,000
Average hedge price	94.56
Swap [Member] \| Natural Gas 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| MmbtuPerDay	245,000
Average hedge price	3.75
Swap [Member] \| Natural Gas 2013 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| MmbtuPerDay	167,521
Average hedge price	3.56
Swap [Member] \| NGLs Propane 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| BblsPerDay	6,000
Average hedge price	38.67
Swap [Member] \| NGLs Propane 2013 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| BblsPerDay	5,000
Average hedge price	35.55
Call Options [Member] \| Crude Oil 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| BblsPerDay	4,700
Weighted average price	85.00
Sold Swap [Member] \| NGLs Natural Gasoline 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| BblsPerDay	12,000
Average hedge price	96.28
Sold Swap [Member] \| NGLs Natural Gasoline 2013 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| BblsPerDay	8,000
Average hedge price	89.64
Purchased Swap [Member] \| NGLs Natural Gasoline 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| BblsPerDay	5,500
Average hedge price	82.37
Purchased Swap [Member] \| NGLs Natural Gasoline 2013 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| BblsPerDay	1,500
Average hedge price	76.30
Put Options [Member] \| Crude Oil 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged \| BblsPerDay	2,500
Weighted average price	80.00

Derivative Activities (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Derivative Activities (Details 1) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Derivative Fair Value Income
Change in fair value of derivatives that do not qualify for hedge accounting	$ 135,777	$ 48,139	$ 83,721	$ 8,103
Realized gain (loss) on settlement - natural gas		3,484		3,090
Realized gain (loss) on settlement - oil	768	(6,094)	(3,854)	(8,012)
Realized gain (loss) on settlement - NGLs	10,152		5,760
Hedge ineffectiveness - realized	1,278	1,576	2,463	2,522
Hedge ineffectiveness - unrealized	594	5,934	(354)	6,502
Derivative fair value income	$ 148,569	$ 53,039	$ 87,736	$ 12,205

Derivative Activities (Details 2) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Derivative assets:
Derivative Assets - Commodity swaps, collars, call and put options	$ 348,986	$ 251,500
Derivative liabilities:
Derivative Liabilities - Commodity swaps, collars, call and put options	(5,688)	(173)
Natural Gas [Member] \| Swap [Member]
Derivative assets:
Derivative Assets - Commodity swaps, collars, call and put options	33,637	54,162
Derivative liabilities:
Derivative Liabilities - Commodity swaps, collars, call and put options	269
Natural Gas [Member] \| Collars [Member]
Derivative assets:
Derivative Assets - Commodity swaps, collars, call and put options	208,178	228,228
Derivative liabilities:
Derivative Liabilities - Commodity swaps, collars, call and put options	(1,112)
Crude Oil [Member] \| Swap [Member]
Derivative assets:
Derivative Assets - Commodity swaps, collars, call and put options	23,744	(263)
Crude Oil [Member] \| Collars [Member]
Derivative assets:
Derivative Assets - Commodity swaps, collars, call and put options	5,254	(16,607)
Crude Oil [Member] \| Call Options [Member]
Derivative assets:
Derivative Assets - Commodity swaps, collars, call and put options	(4,723)	(29,348)
Crude Oil [Member] \| Put Options [Member]
Derivative assets:
Derivative Assets - Commodity swaps, collars, call and put options	1,071
NGLs [Member] \| C3 Swap [Member]
Derivative assets:
Derivative Assets - Commodity swaps, collars, call and put options	2,333
Derivative liabilities:
Derivative Liabilities - Commodity swaps, collars, call and put options	(1,613)
NGLs [Member] \| C5 Swap [Member]
Derivative assets:
Derivative Assets - Commodity swaps, collars, call and put options	79,492	15,328
Derivative liabilities:
Derivative Liabilities - Commodity swaps, collars, call and put options	$ (3,232)	$ (173)

Derivative Activities (Details 3) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Derivatives that qualify for cash flow hedge accounting :
Assets Carrying Value	$ 287,725	$ 282,546
Liabilities Carrying Value	(13,758)	(2,373)
Net Carrying Value	273,967	280,173
Derivatives that do not qualify for hedge accounting :
Assets Carrying Value	88,768	17,949
Liabilities Carrying Value	(19,437)	(46,795)
Net Carrying Value	69,331	(28,846)
Swap [Member]
Derivatives that qualify for cash flow hedge accounting :
Assets Carrying Value	65,114	54,318
Liabilities Carrying Value	(7,464)	(419)
Net Carrying Value	57,650	53,899
Collars [Member]
Derivatives that qualify for cash flow hedge accounting :
Assets Carrying Value	221,540	228,228
Liabilities Carrying Value	(6,294)	(1,954)
Net Carrying Value	215,246	226,274
Derivatives that do not qualify for hedge accounting :
Liabilities Carrying Value	(2,925)	(14,653)
Net Carrying Value	(2,925)	(14,653)
Call Options [Member]
Derivatives that do not qualify for hedge accounting :
Liabilities Carrying Value	(4,723)	(29,348)
Net Carrying Value	(4,723)	(29,348)
Put Options [Member]
Derivatives that qualify for cash flow hedge accounting :
Assets Carrying Value	1,071
Net Carrying Value	1,071
Purchased Swap [Member]
Derivatives that do not qualify for hedge accounting :
Assets Carrying Value	1,506
Liabilities Carrying Value	(8,447)
Net Carrying Value	(6,941)
Sold Swap [Member]
Derivatives that do not qualify for hedge accounting :
Assets Carrying Value	87,262	17,949
Liabilities Carrying Value	(3,342)	(2,794)
Net Carrying Value	$ 83,920	$ 15,155

Derivative Activities (Details 4) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Derivative Activities (Details 4) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Effects of cash flow hedges and other hedges on accumulated other comprehensive income (loss)
Change in unrealized deferred hedging gains, tax effect,	$ (3,077)	$ (10,454)	$ (55,183)	$ (7,414)
Change in Hedge Derivative Fair value, effects of Cash flow hedges on accumulated other comprehensive income (loss) total	4,813	17,424	83,787	17,537
Realized Gain Reclassified from AOCI into Revenue, Income taxes	(30,646)	(9,107)	(52,834)	(23,441)
Realized gain on hedge derivative contract settlements reclassified into earnings from other comprehensive income, net of taxes	47,934	15,178	83,376	39,068
Swap [Member]
Effects of cash flow hedges and other hedges on accumulated other comprehensive income (loss)
Change in Hedge Derivative Fair Value	19,665	4,655	55,836	2,115
Realized Gain Reclassified from AOCI into Revenue	32,334		51,647
Put Options [Member]
Effects of cash flow hedges and other hedges on accumulated other comprehensive income (loss)
Change in Hedge Derivative Fair Value	648		(914)
Realized Gain Reclassified from AOCI into Revenue	(315)		(315)
Collars [Member]
Effects of cash flow hedges and other hedges on accumulated other comprehensive income (loss)
Change in Hedge Derivative Fair Value	(12,423)	23,223	84,048	22,424
Realized Gain Reclassified from AOCI into Revenue	$ 46,561	$ 24,285	$ 84,878	53,902
Collars discontinued operations [Member]
Effects of cash flow hedges and other hedges on accumulated other comprehensive income (loss)
Change in Hedge Derivative Fair Value				412
Realized Gain Reclassified from AOCI into Revenue				$ 8,607

Derivative Activities (Details 5) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Derivative Activities (Details 5) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Effects of non-hedge derivatives on consolidated statement of operations
Gain (Loss) Recognized in Income (Non-hedge Derivatives)	$ 146,697	$ 45,529	$ 85,627	$ 3,181
Gain (Loss) Recognized in Income (Ineffective Portion)	1,872	7,510	2,109	9,024
Derivative fair value income	148,569	53,039	87,736	12,205
Swap [Member]
Effects of non-hedge derivatives on consolidated statement of operations
Gain (Loss) Recognized in Income (Non-hedge Derivatives)	129,313	15,613	76,328	13,750
Gain (Loss) Recognized in Income (Ineffective Portion)	562		666
Derivative fair value income	129,875	15,613	76,994	13,750
Collars [Member]
Effects of non-hedge derivatives on consolidated statement of operations
Gain (Loss) Recognized in Income (Non-hedge Derivatives)	14,894	6,452	12,392	(1,135)
Gain (Loss) Recognized in Income (Ineffective Portion)	1,310	7,510	1,443	9,024
Derivative fair value income	16,204	13,962	13,835	7,889
Call Options [Member]
Effects of non-hedge derivatives on consolidated statement of operations
Gain (Loss) Recognized in Income (Non-hedge Derivatives)	11,234	23,464	5,651	(9,391)
Derivative fair value income	11,234	$ 23,464	5,651	(9,391)
Basis Swap [Member]
Effects of non-hedge derivatives on consolidated statement of operations
Gain (Loss) Recognized in Income (Non-hedge Derivatives)				(43)
Derivative fair value income				$ (43)
Purchased Swap [Member]
Effects of non-hedge derivatives on consolidated statement of operations
Gain (Loss) Recognized in Income (Non-hedge Derivatives)	(8,744)		(8,744)
Derivative fair value income	$ (8,744)		$ (8,744)

Derivative Activities (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended
Derivative Activities (Details Textual) $ in Thousands	Jun. 30, 2012 USD ($) Bcf MMBbls $ / barrel $ / DerivativePrice	Jun. 30, 2011 USD ($)	Jun. 30, 2012 USD ($) Bcf MMBbls Financial_Institutions $ / barrel $ / DerivativePrice	Jun. 30, 2011 USD ($)
Derivative Activities (Textual) [Abstract]
Derivative assets liabilities at fair value net	$ 343,300		$ 343,300
Unrealized pre-tax derivative gain			257,400
Gains (Losses) in oil and gas sales related to settled hedging transactions	78,600	$ 24,300	136,200	$ 53,900
Ineffective unrealized and realized gains (losses) recognized income	$ 1,872	$ 7,510	$ 2,109	$ 9,024
Number of financial institutions with whom we conduct derivative activities \| Financial_Institutions			16
Number of counter parties not included in bank credit facility \| Financial_Institutions			2
Collar Oil [Member]
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| MMBbls	2.2		2.2
Average floor price \| $ / barrel	85.46		85.46
Average cap price \| $ / barrel	96.64		96.64
Collars Gas [Member]
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| Bcf	228.5		228.5
Average floor price \| $ / DerivativePrice	4.35		4.35
Average cap price \| $ / DerivativePrice	4.93		4.93
Call Option Oil [Member]
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| MMBbls	0.9		0.9
Weighted average price \| $ / barrel	85.00		85.00
Put Option Oil [Member]
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| MMBbls	0.5		0.5
Weighted average price \| $ / barrel	80.00		80.00
Swap Oil [Member]
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| MMBbls	3.2		3.2
Average price of SWAP per MCF \| $ / DerivativePrice	95.61		95.61
2012 [Member]
Derivative [Line Items]
Unrealized pre-tax derivative gain expected to be reclassified into earnings			$ 114,500
2013 [Member]
Derivative [Line Items]
Unrealized pre-tax derivative gain expected to be reclassified into earnings			121,900
2014 [Member]
Derivative [Line Items]
Unrealized pre-tax derivative gain expected to be reclassified into earnings			$ 21,000
Swap Natural Gas [Member]
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| Bcf	106.2		106.2
Average price of SWAP per MCF \| $ / DerivativePrice	3.64		3.64
NGLs (C5 component) [Member]
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| MMBbls	3.6		3.6
Average price of SWAP per MCF \| $ / DerivativePrice	97.85		97.85
NGLs (C3Component) [Member]
Derivative [Line Items]
Natural gas liquids in Barrels \| MMBbls	2.9		2.9
Average price of SWAP per MCF \| $ / DerivativePrice	36.73		36.73

Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	$ 343,300
Fair Value, Measurements, Recurring [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Trading securities held in the deferred compensation plans	56,345	$ 50,237
Fair Value, Measurements, Recurring [Member] \| Collars [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	212,320	211,621
Fair Value, Measurements, Recurring [Member] \| Swap [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	134,629	69,054
Fair Value, Measurements, Recurring [Member] \| Call Options [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	(4,722)	(29,348)
Fair Value, Measurements, Recurring [Member] \| Put Options [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	1,071
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Trading securities held in the deferred compensation plans	56,345	50,237
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets [Member] \| Collars [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets [Member] \| Swap [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets [Member] \| Call Options [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets [Member] \| Put Options [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Trading securities held in the deferred compensation plans
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs [Member] \| Collars [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	212,320	211,621
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs [Member] \| Swap [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	134,629	69,054
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs [Member] \| Call Options [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	(4,722)	(29,348)
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs [Member] \| Put Options [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	1,071
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Trading securities held in the deferred compensation plans
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs [Member] \| Collars [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs [Member] \| Swap [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs [Member] \| Call Options [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs [Member] \| Put Options [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net

Fair Value Measurements (Details 1) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Assets
Commodity swaps, collars, call and put options	$ 348,986	$ 251,500
Liabilities
Derivative Liabilities - Commodity swaps, collars, call and put options	(5,688)	(173)
Bank debt	(235,000)	(187,000)
Subordinated debt	(2,388,562)	(1,787,967)
Carrying Value [Member]
Assets
Commodity swaps, collars, call and put options	348,986	251,500
Marketable securities	56,345	50,237
Liabilities
Derivative Liabilities - Commodity swaps, collars, call and put options	(5,688)	(173)
Bank debt	(235,000)	(187,000)
Fair Value [Member]
Assets
Commodity swaps, collars, call and put options	348,986	251,500
Marketable securities	56,345	50,237
Liabilities
Derivative Liabilities - Commodity swaps, collars, call and put options	(5,688)	(173)
Bank debt	(235,000)	(187,000)
5.75% Senior Subordinated Notes due 2021 [Member] \| Carrying Value [Member]
Liabilities
Subordinated debt	(500,000)	(500,000)
5.75% Senior Subordinated Notes due 2021 [Member] \| Fair Value [Member]
Liabilities
Subordinated debt	(522,500)	(541,250)
7.50% Senior Subordinated Notes due 2017 [Member] \| Carrying Value [Member]
Liabilities
Subordinated debt	(250,000)	(250,000)
7.50% Senior Subordinated Notes due 2017 [Member] \| Fair Value [Member]
Liabilities
Subordinated debt	(261,250)	(265,625)
7.25% Senior Subordinated notes due 2018 [Member]
Liabilities
Subordinated debt	(250,000)	(250,000)
7.25% Senior Subordinated notes due 2018 [Member] \| Carrying Value [Member]
Liabilities
Subordinated debt	(250,000)	(250,000)
7.25% Senior Subordinated notes due 2018 [Member] \| Fair Value [Member]
Liabilities
Subordinated debt	(265,000)	(267,500)
8.00% Senior Subordinated notes due 2019 [Member]
Liabilities
Subordinated debt	(288,562)	(287,967)
8.00% Senior Subordinated notes due 2019 [Member] \| Carrying Value [Member]
Liabilities
Subordinated debt	(288,562)	(287,967)
8.00% Senior Subordinated notes due 2019 [Member] \| Fair Value [Member]
Liabilities
Subordinated debt	(327,750)	(334,500)
6.75% Senior Subordinated notes due 2020 [Member]
Liabilities
Subordinated debt	(500,000)	(500,000)
6.75% Senior Subordinated notes due 2020 [Member] \| Carrying Value [Member]
Liabilities
Subordinated debt	(500,000)	(500,000)
6.75% Senior Subordinated notes due 2020 [Member] \| Fair Value [Member]
Liabilities
Subordinated debt	(542,500)	(555,000)
5.00% Senior Subordinated notes due 2022 [Member]
Liabilities
Subordinated debt	(600,000)
5.00% Senior Subordinated notes due 2022 [Member] \| Carrying Value [Member]
Liabilities
Subordinated debt	(600,000)
5.00% Senior Subordinated notes due 2022 [Member] \| Fair Value [Member]
Liabilities
Subordinated debt	$ (592,500)

Fair Value Measurements (Details Textual)	3 Months Ended		6 Months Ended
Fair Value Measurements (Details Textual)	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2012 USD ($) Financial_Institutions	Jun. 30, 2011 USD ($)	Dec. 31, 2011 USD ($)
Fair Value Measurements (Textual) [Abstract]
Interest and dividends	$ 125,000	$ 60,000	$ 275,000	$ 95,000
Mark-to-market gain (loss)	(2,100,000)	$ 5,000	1,900,000	$ 1,300,000
Allowance for uncollectible receivables	2,800,000		2,800,000		$ 4,000,000
Net Derivative Asset	$ 26,500,000		$ 26,500,000
Number of financial institutions included in counterparties \| Financial_Institutions			16
Number of counter parties not included in bank credit facility \| Financial_Institutions			2
7.50% Senior Subordinated Notes due 2017 [Member]
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	7.50%		7.50%		7.50%
5.75% Senior Subordinated Notes due 2021 [Member]
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	5.75%		5.75%		5.75%
7.25% Senior Subordinated notes due 2018 [Member]
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	7.25%		7.25%		7.25%
8.00% senior subordinated notes due 2019, net of discount [Member]
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	8.00%		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%		6.75%
5.00% Senior Subordinated notes due 2022 [Member]
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	5.00%		5.00%

Stock-Based Compensation Plans (Details)	6 Months Ended
Stock-Based Compensation Plans (Details)	Jun. 30, 2012 $ / shares shares
Stock option and SARs activities
Beginning Balance, Shares \| shares	4,558,609
Beginning Balance, Weighted Average Exercise Price \| $ / shares	$ 41.47
Granted \| $ / shares	$ 64.14
Granted, Shares \| shares	754,471
Exercised \| $ / shares	$ 21.90
Exercised, Shares \| shares	(1,218,780)
Expired/forfeited, Shares \| shares	(6,196)
Expired/forfeited \| $ / shares	$ 48.31
Ending Balance, Shares \| shares	4,088,104
Ending Balance, Weighted Average Exercise Price \| $ / shares	$ 51.48

Stock-Based Compensation Plans (Details 1)	6 Months Ended
Stock-Based Compensation Plans (Details 1)	Jun. 30, 2012 $ / shares
Weighted average grant date fair value of these SARs
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	0.40%
Weighted average grant date fair value	$ 21.32

Stock-Based Compensation Plans (Details 2)	6 Months Ended
Stock-Based Compensation Plans (Details 2)	Jun. 30, 2012 $ / shares shares
Restricted stock and Restricted stock units outstanding
Granted \| $ / shares	$ 21.32
Vested, Shares \| shares	(52,417)
Equity Awards [Member]
Restricted stock and Restricted stock units outstanding
Beginning Balance, Shares \| shares	221,609
Beginning Balance, Weighted Average Grant Date Fair Value \| $ / shares	$ 49.64
Granted \| $ / shares	$ 63.37
Granted, Shares \| shares	359,732
Vested \| $ / shares	$ 56.87
Vested, Shares \| shares	(85,294)
Forfeited \| $ / shares	$ 57.56
Forfeited, Shares \| shares	(14,307)
Ending Balance, Shares \| shares	481,740
Ending Balance, Weighted Average Grant Date Fair Value \| $ / shares	$ 58.37
Liability Awards [Member]
Restricted stock and Restricted stock units outstanding
Beginning Balance, Shares \| shares	487,244
Beginning Balance, Weighted Average Grant Date Fair Value \| $ / shares	$ 48.76
Granted \| $ / shares	$ 63.89
Granted, Shares \| shares	370,059
Vested \| $ / shares	$ 50.51
Vested, Shares \| shares	(227,844)
Forfeited \| $ / shares	$ 51.39
Forfeited, Shares \| shares	(1,717)
Ending Balance, Shares \| shares	627,742
Ending Balance, Weighted Average Grant Date Fair Value \| $ / shares	$ 57.04

Stock-Based Compensation Plans (Details Textual)	3 Months Ended			6 Months Ended		12 Months Ended
Stock-Based Compensation Plans (Details Textual)	Jun. 30, 2012 USD ($) shares	Jun. 30, 2011 USD ($)	Mar. 31, 2011	Jun. 30, 2012 USD ($) Plan $ / shares shares	Jun. 30, 2011 USD ($) $ / shares shares	Dec. 31, 2011 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Outstanding Under the Plans \| shares	4,088,104			4,088,104		4,558,609
Vesting period of awards				3 years
Expiration term of stock options				5 years
Operating expense	$ 27,041,000	$ 28,509,000		$ 56,063,000	$ 57,226,000
Exploration expense	15,517,000	11,592,000		37,033,000	38,779,000
General and administrative expense	44,005,000	39,120,000		$ 82,734,000	73,079,000
Vesting period of shares granted to employees				3 years
Stock-based compensation expense				$ 1,921,000		$ 4,108,000
Stock based compensation plans (Textual) [Abstract]
Stock-Based Compensation Expense	$ 14,600,000	13,400,000		$ 24,500,000	22,900,000
Active equity-based stock plans \| Plan				2
Number of stock option outstanding \| shares	32,000			32,000
Number of SARs outstanding \| shares	4,000,000			4,000,000
Non-cash, Mark-to-market income (loss) related to deferred compensation plan	$ (9,300,000)	5,800,000		$ (1,500,000)	$ (24,900,000)
Shares held in rabbi trust total \| shares	3,000,000			3,000,000		2,800,000
Vested shares held in rabbi trust \| shares	2,300,000			2,300,000		2,200,000
Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards				3 years
Expiration term of stock options				5 years
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				3 years	3 years
Stock-based compensation expense				$ 5,200,000	$ 1,700,000
Liability Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted to employees \| shares				355,400	334,000
Vesting period of shares granted to employees				3 years	3 years
Restricted Stock granted to employees average price \| $ / shares				$ 63.87	$ 51.10
Restricted Stock granted to directors average price \| $ / shares				$ 64.35	$ 52.35
Stock-based compensation expense				$ 10,200,000	$ 10,400,000
Shares granted to directors \| shares				14,700	15,500
Share Based Compensation Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Operating expense	$ 692,000	643,000		$ 1,000,000	$ 953,000
Exploration expense	994,000	937,000		1,900,000	2,300,000
General and administrative expense	$ 12,500,000	$ 11,500,000		$ 20,700,000	$ 19,000,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards			3 years

Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Net cash provided from operating activities included:
Income taxes paid to taxing authorities	$ 246	$ 308
Interest paid	66,438	68,002
Non-cash investing and financing activities included:
Asset retirement costs capitalized, net	$ 4,004	$ 12,717

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Natural gas and oil properties:
Properties subject to depletion	$ 6,779,021	$ 6,035,429
Unproved properties	817,409	748,598
Total	7,596,430	6,784,027
Accumulated depreciation, depletion and amortization	(1,825,390)	(1,626,461)
Net capitalized costs	$ 5,771,040	$ 5,157,566

Costs Incurred for Property Acquisition, Exploration and Development (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Costs Incurred for Property Acquisition, Exploration and Development
Acreage purchases	$ 151,622	$ 220,576
Development	539,122	1,007,049
Exploration:
Drilling	185,081	226,920
Expense	35,112	77,259
Stock-based compensation expense	1,921	4,108
Gas gathering facilities:
Development	23,684	53,387
Subtotal	936,542	1,589,299
Asset retirement obligations	4,004	24,061
Total - continuing operations	940,546	1,613,360
Discontinued operations	0	3,241
Total costs incurred	$ 940,546	$ 1,616,601