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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2013	Apr. 23, 2013
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Trading Symbol	RRC
Entity Registrant Name	RANGE RESOURCES CORP
Entity Central Index Key	0000315852
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		163,072,587

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 194	$ 252
Accounts receivable, less allowance for doubtful accounts of $2,368 and $2,374	152,670	167,495
Assets held for sale	165,478
Deferred tax asset	12,646
Unrealized derivative gain	23,052	137,552
Inventory and other	16,600	22,315
Total current assets	370,640	327,614
Unrealized derivative gain	4,387	15,715
Equity method investments	129,954	132,449
Natural gas and oil properties, successful efforts method	8,128,200	8,111,775
Accumulated depletion and depreciation	(1,944,252)	(2,015,591)
Natural gas and oil properties, successful efforts method, net	6,183,948	6,096,184
Transportation and field assets	116,448	117,717
Accumulated depreciation and amortization	(78,149)	(76,150)
Transportation and field assets, net	38,299	41,567
Other assets	139,303	115,206
Total assets	6,866,531	6,728,735
Current liabilities:
Accounts payable	363,273	234,651
Asset retirement obligations	2,366	2,470
Liabilities held for sale	8,346
Accrued liabilities	175,338	139,379
Deferred tax liability		37,924
Accrued interest	38,678	36,248
Unrealized derivative loss	19,662	4,471
Total current liabilities	607,663	455,143
Bank debt	47,000	739,000
Subordinated notes	2,889,505	2,139,185
Deferred tax liability	683,857	698,302
Unrealized derivative loss	8,370	3,463
Deferred compensation liability	222,700	187,604
Asset retirement obligations and other liabilities	150,044	148,646
Total liabilities	4,609,139	4,371,343
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, issued at March 31, 2013 and 162,641,896 issued at December 31, 2012	1,630	1,626
Common stock held in treasury, shares at March 31, 2013 and 127,798 shares at December 31, 2012	(3,767)	(4,760)
Additional paid-in capital	1,924,619	1,915,627
Retained earnings	278,859	360,990
Accumulated other comprehensive income	56,051	83,909
Total stockholders' equity	2,257,392	2,357,392
Total liabilities and stockholders' equity	$ 6,866,531	$ 6,728,735

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Allowance for doubtful accounts on accounts receivable	$ 2,368	$ 2,374
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	163,068,565	162,641,896
Common stock held in treasury, shares	101,772	127,798

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues and other income:
Natural gas, NGLs and oil sales	$ 398,239	$ 317,617
Derivative fair value loss	(99,875)	(60,833)
Loss on the sale of assets	(166)	(10,426)
Brokered natural gas, marketing and other	21,041	4,597
Total revenues and other income	319,239	250,955
Costs and expenses:
Direct operating	30,188	29,022
Transportation, gathering and compression	62,416	40,820
Production and ad valorem taxes	11,383	36,634
Brokered natural gas and marketing	22,315	4,062
Exploration	16,780	21,516
Abandonment and impairment of unproved properties	15,218	20,289
General and administrative	84,058	38,729
Deferred compensation plan	42,360	(7,830)
Interest expense	42,210	37,205
Depletion, depreciation and amortization	115,101	100,151
Total costs and expenses	442,029	320,598
Loss from operations before income taxes	(122,790)	(69,643)
Income tax (benefit) expense
Current	25
Deferred	(47,205)	(27,843)
Total income tax expense	(47,180)	(27,843)
Net loss	$ (75,610)	$ (41,800)
Net loss per common share:
Basic	$ (0.47)	$ (0.26)
Diluted	(0.47)	(0.26)
Dividends per common share	$ 0.04	$ 0.04
Weighted average common shares outstanding:
Basic	160,125	158,913
Diluted	160,125	158,913

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net loss	$ (75,610)	$ (41,800)
Other comprehensive income:
Realized loss (gain) on hedge derivative contract settlements reclassified into earnings from other comprehensive income, net of taxes	(14,840)	(35,442)
Amortization related to de-designated hedges, net of taxes	(7,425)
Change in unrealized deferred hedging (losses) gains, net of taxes	(5,593)	78,974
Total comprehensive (loss) income	$ (103,468)	$ 1,732

- Definition

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

+ References + Details

- Definition

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

+ References

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- Definition

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

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+ Details

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities:
Net loss	$ (75,610)	$ (41,800)
Adjustments to reconcile net loss to net cash provided from operating activities:
Loss from equity method investments, net of distributions	610	251
Deferred income tax benefit	(47,205)	(27,843)
Depletion, depreciation and amortization and impairment	115,101	100,151
Exploration dry hole costs	(159)	709
Mark-to-market on natural gas, NGLs and oil derivatives not designated as hedges	96,802	52,056
Abandonment and impairment of unproved properties	15,218	20,289
Unrealized derivative loss	3,455	948
Amortization of deferred financing costs, loss on extinguishment of debt and other	2,080	1,848
Deferred and stock-based compensation	54,991	2,508
Loss on the sale of assets	166	10,426
Changes in working capital:
Accounts receivable	1,292	11,947
Inventory and other	166	(897)
Accounts payable	5,775	8,962
Accrued liabilities and other	28,567	16,422
Net cash provided from operating activities	201,249	155,977
Investing activities:
Additions to natural gas and oil properties	(259,601)	(376,943)
Additions to field service assets	(1,071)	(1,622)
Acreage purchases	(8,794)	(74,268)
Equity method investments	1,885
Proceeds from disposal of assets	38,196	9,852
Purchases of marketable securities held by the deferred compensation plan	(17,936)	(3,061)
Proceeds from the sales of marketable securities held by the deferred compensation plan	6,316	2,183
Net cash used in investing activities	(241,005)	(443,859)
Financing activities:
Borrowing on credit facilities	368,000	340,000
Repayment on credit facilities	(1,060,000)	(527,000)
Issuance of subordinated notes	750,000	600,000
Dividends paid	(6,521)	(6,473)
Debt issuance costs	(12,098)	(11,242)
Issuance of common stock	343	1,266
Change in cash overdrafts	(12,458)	12,969
Proceeds from the sales of common stock held by the deferred compensation plan	12,432	1,168
Net cash provided from financing activities	39,698	410,688
(Decrease) increase in cash and cash equivalents	(58)	122,806
Cash and cash equivalents at beginning of period	252	92
Cash and cash equivalents at end of period	$ 194	$ 122,898

BASIS OF PRESENTATION

3 Months Ended

Mar. 31, 2013

SUMMARY OF ORGANIZATION AND NATURE OF BUSINESS

(1) SUMMARY OF ORGANIZATION AND NATURE OF BUSINESS

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

BASIS OF PRESENTATION

(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 2012 Annual Report on Form 10-K filed on February 27, 2013. The results of operations for the quarter ended March 31, 2013 are not necessarily indicative of the results to be expected for the full year. These consolidated financial statements are unaudited but, in the opinion of management, reflect all adjustments necessary for fair presentation of the results for the periods presented. All adjustments are of a normal recurring nature unless otherwise disclosed. These consolidated financial statements, including selected notes, have been prepared in accordance with the applicable rules of the Securities and Exchange Commission and do not include all of the information and disclosures required by accounting principles generally accepted in the United States of America (“U.S. GAAP”) for complete financial statements. Certain reclassifications have been made to prior year’s reported amounts in order to conform with the current year presentation. These reclassifications include gas purchases and other marketing costs which were previously reported in other income and are currently reported as a separate operating expense. These reclassifications have no impact on previously reported net income.

In first quarter 2012, the Pennsylvania legislature passed an “impact fee” on unconventional natural gas and oil production. The impact fee is a per well annual fee imposed for a period of fifteen years on all unconventional wells drilled in Pennsylvania. The fee is based on the average annual price of natural gas and the Consumer Price Index. The annual fee per well declines each year over the fifteen year time period as long as the well is producing. In the first three months of 2012, we recorded a retroactive impact fee of $24.0 million for wells drilled during 2011 and prior. This expense is reflected in our statements of operations category production and ad valorem taxes.

Assets Held for Sale

Any properties held for sale as of the balance sheet date are separately presented on the accompanying balance sheets at the lower of net book value or fair value less the cost to sell. The asset retirement obligations liabilities related to such properties have been reclassified to liabilities held for sale. On February 26, 2013, we announced we signed a definitive agreement to sell certain of our Permian and Delaware Basin properties for a price of $275.0 million, subject to normal post-closing adjustments. Refer to Note 4 for additional discussion on these assets. As of March 31, 2013, the carrying value of these assets held for sale is composed of the following (in thousands).

	March 31, 2013

Composition of assets held for sale:
Oil and gas properties	$ 161,140
Transportation and field assets	3
Accounts receivable and other	4,117
Inventory	218

	$ 165,478

Composition of liabilities held for sale:
Accounts payable	$ (354)
Asset retirement obligation	(2,816)
Accrued liabilities	(5,176)
	$ (8,346)

De-designation of commodity derivative contracts

Effective March 1, 2013, we elected to discontinue hedge accounting prospectively. After March 1, 2013, both realized and unrealized gains and losses will be recognized in earnings immediately each quarter as derivative contracts are settled and marked to market. For first quarter 2013, unrealized losses of $81.4 million were included in our statements of operations that, prior to March 1, 2013, would have been deferred in accumulated other comprehensive income (“AOCI”) if we continued using hedge accounting. Refer to Note 11 for additional information.

- Definition

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

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+ Details

NEW ACCOUNTING STANDARDS

3 Months Ended

Mar. 31, 2013

NEW ACCOUNTING STANDARDS

(3) NEW ACCOUNTING STANDARDS

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. Also, in January 2013, the FASB issued ASU No. 2013-01, “Balance Sheet (Topic 210). Clarifying the Scope of Disclosures about offsetting Assets and Liabilities.” ASU 2013-01 limited the disclosures required by ASU No. 2011-11. We adopted these new requirements in first quarter 2013 and they did not have a material effect on our consolidated financial statements.

In February 2013, the FASB issued ASU No. 2013-02, “Comprehensive Income (Topic 220): Reporting of Amounts Reclassified out of Accumulated Other Comprehensive Income.” ASU 2013-02 requires information to be disclosed about the amounts reclassified out of AOCI by component. We adopted this new requirement in first quarter 2013 and it did not have a material effect on our consolidated financial statements.

The following table details the components of AOCI and related tax effects for the three months ended March 31, 2013 and March 31, 2012 (in thousands).

	2013				2012

	Gross	Tax Effect	Net of Tax	Gross		Tax Effect	Net of Tax

AOCI at beginning of period	$ 137,555	$ (53,646)	$ 83,909	$ 254,678		$ (98,051)	$ 156,627
Derivative contract settlements reclassified to natural gas, NGLs and oil sales	(24,328)	9,488	(14,840)	(57,629)		22,187	(35,442)
Amortization related to de- designated hedges	(12,172)	4,747	(7,425)	—		—	—
Change in unrealized deferred hedging gains	(9,169)	3,576	(5,593)	131,081		(52,107)	78,974

AOCI at March 31	$ 91,886	$ (35,835)	$ 56,051	$ 328,130		$ (127,971)	$ 200,159

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

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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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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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 01
-Paragraph b
-Subparagraph 6
-Article 10

+ Details

DISPOSITIONS

3 Months Ended

Mar. 31, 2013

DISPOSITIONS

(4) DISPOSITIONS

2013 Dispositions

In December 2012, we announced our plan to offer for sale certain of our Delaware and Permian Basin properties in southeast New Mexico and West Texas. The data room opened in early January 2013, and on February 26, 2013, we announced we signed a definitive agreement to sell these assets for a price of $275.0 million, subject to normal post-closing adjustments. We closed this disposition on April 1 and estimate that we will recognize a gain of approximately $84.0 million in second quarter 2013 related to this sale. In first quarter 2013, we received a deposit of $27.5 million related to this sale, which is reflected as a reduction of assets held for sale. Also in first quarter 2013, we received $10.0 million of proceeds from the sale of miscellaneous oil and gas property in Pennsylvania.

2012 Dispositions

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.

INCOME TAXES

3 Months Ended

Mar. 31, 2013

INCOME TAXES

(5) INCOME TAXES

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


	Three Months Ended March 31,

	2013	2012

Income tax benefit	$ (47,180)	$ (27,843)
Effective tax rate	38.4%	40.0 %

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 the first three months ended March 31, 2013 and 2012, our overall effective tax rate on pre-tax loss from operations was different than the federal statutory rate of 35% due primarily to state income taxes, valuation allowances and other permanent differences.

- Definition

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

+ References

+ Details

INCOME (LOSS) PER COMMON SHARE

3 Months Ended

Mar. 31, 2013

INCOME (LOSS) PER COMMON SHARE

(6) LOSS PER COMMON SHARE

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




	Three Months Ended March 31, 2013	Three Months Ended March 31, 2012

Net loss, as reported	$ (75,610)	$ (41,800)
Participating basic earnings (a)	(109)	(113)

Basic net loss attributed to common shareholders	(75,719)	(41,913)
Reallocation of participating earnings (a)	—	—

Diluted net loss attributed to common shareholders	$ (75,719)	$ (41,913)

Net loss per common share:
Basic	$ (0.47)	$ (0.26)
Diluted	$ (0.47)	$ (0.26)

(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.

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 March 31,

	2013	2012

Denominator:
Weighted average common shares outstanding – basic	160,125	158,913
Effect of dilutive securities:
Director and employee stock options and SARs	—	—

Weighted average common shares outstanding – diluted	160,125	158,913

Weighted average common shares – basic for the three months ended March 31, 2013 excludes 2.7 million shares and the three months ended March 31, 2012 excludes 2.8 million shares of restricted stock held in our deferred compensation plans (although all awards are issued and outstanding upon grant). Due to our loss from operations for the three months ended March 31, 2013 and March 31, 2012, we excluded all outstanding stock appreciation rights (“SARs”) and restricted stock from the computations of diluted net loss per share because the effect would have been anti-dilutive to the computations.

SUSPENDED EXPLORATORY WELL COSTS

3 Months Ended

Mar. 31, 2013

SUSPENDED EXPLORATORY WELL COSTS

(7) 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 three months ended March 31, 2013 and the year ended December 31, 2012 (in thousands except for number of projects):


	March 31, 2013	December 31, 2012

Balance at beginning of period	$ 57,360	$ 93,388
Additions to capitalized exploratory well costs pending the determination of proved reserves	62,640	153,250
Reclassifications to wells, facilities and equipment based on determination of proved reserves	(58,601)	(184,298)
Divested wells	—	(4,980)

Balance at end of period	61,399	57,360
Less exploratory well costs that have been capitalized for a period of one year or less	(39,140)	(45,965)

Capitalized exploratory well costs that have been capitalized for a period greater than one year	$ 22,259	$ 11,395

Number of projects that have exploratory well costs that have been capitalized for a period greater than one year	9	5

As of March 31, 2013, $22.3 million of capitalized exploratory well costs have been capitalized for more than one year with six of the wells waiting on pipelines and three of the wells currently in the completion stage. Five of the wells are not operated by us and eight of the wells are in Pennsylvania. In first quarter 2012, we sold a seventy-five percent interest in an East Texas exploratory well. Refer to Note 4 for additional information.

The following table provides an aging of capitalized exploratory well costs that have been suspended for more than one year as of March 31, 2013 (in thousands):

	Total	2013	2012	2011	2010	2009	2008

Capitalized exploratory well costs that have been capitalized for more than one year	$ 22,259	$ 5,854	$ 5,961	$ 5,965	$ 72	$ 2,884	$ 1,523

INDEBTEDNESS

3 Months Ended

Mar. 31, 2013

INDEBTEDNESS

(8) INDEBTEDNESS

We had the following debt outstanding as of the dates shown below (in thousands) (bank debt interest rate at March 31, 2013 is shown parenthetically). No interest was capitalized during the three months ended March 31, 2013 or 2012.


	March 31, 2013	December 31, 2012

Bank debt (3.7%)	$ 47,000	$ 739,000
Senior subordinated notes:
7.25% senior subordinated notes due 2018	250,000	250,000
8.00% senior subordinated notes due 2019, net of $10,495 and $10,815 discount, respectively	289,505	289,185
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	600,000
5.00% senior subordinated notes due 2023	750,000	—

Total debt	$ 2,936,505	$ 2,878,185

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 March 31, 2013, the facility amount was $1.75 billion and the borrowing base was $2.0 billion. The bank credit facility provides for a borrowing base subject to redeterminations semi-annually and for event-driven unscheduled redeterminations. As part of our semi-annual bank review completed on April 8, 2013, our borrowing base was reaffirmed at $2.0 billion and our facility amount was also reaffirmed at $1.75 billion. Our current bank group is composed of twenty-eight financial institutions, with no one bank holding more than 9% of the total facility. 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 March 31, 2013, the outstanding balance under our bank credit facility was $47.0 million. Additionally, we had $84.7 million of undrawn letters of credit leaving $1.6 billion of borrowing capacity available under the facility amount. The facility matures on February 18, 2016. Borrowings under the bank facility can either be at the Alternate Base Rate (as defined) plus a spread ranging from 0.50% to 1.5% or LIBOR borrowings at the Adjusted LIBO Rate (as defined) plus a spread ranging from 1.5% to 2.5%. The applicable spread is dependent upon borrowings relative to the borrowing base. We may elect, from time to time, to convert all or any part of our LIBOR loans to base rate loans or to convert all or any of the base rate loans to LIBOR loans. The weighted average interest rate was 2.1% for both the three months ended March 31, 2013 and the three months ended March 31, 2012. A commitment fee is paid on the undrawn balance based on an annual rate of 0.375% to 0.50%. At March 31, 2013, 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. On March 31, 2013, the borrowings under the credit facility were at the base rate.

Senior Subordinated Notes

In March 2013, we issued $750.0 million aggregate principal amount of 5.00% senior subordinated notes due 2023 (“5.00% Notes due 2023”) for net proceeds of $738.8 million after underwriting discounts and commissions of $11.2 million. The 5.00% Notes due 2023 were issued at par. Interest on the 5.00% Notes due 2023 is payable semi-annually in March and September and is guaranteed by all of our subsidiary guarantors. We may redeem the 5.00% Notes due 2023, in whole or in part, at any time on or after March 15, 2018, at a redemption price of 102.5% of the principal amount as of March 15, 2018, declining to 100% on March 15, 2021 and thereafter. Before March 15, 2016, we may redeem up to 35% of the original aggregate principal amount of the 5.00% Notes due 2023 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 due 2023 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 due 2023, we used the proceeds to pay down our outstanding bank 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.

Early Extinguishment of Debt

On April 2, 2013, we announced a call for redemption of the $250.0 million of our outstanding 7.25% senior subordinated notes due 2018 at 103.625% of par. The notes will be redeemed on May 2, 2013.

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, subject to certain customary release provisions. A subsidiary guarantor may be released from its obligations under the guarantee:

in the event of a sale or other disposition of all or substantially all of the assets of the subsidiary guarantor or a sale or other disposition of all the capital stock of the subsidiary guarantor, to any corporation or other person (including an unrestricted subsidiary of Range) by way of merger, consolidation, or otherwise; or
if Range designates any restricted subsidiary that is a guarantor to be an unrestricted subsidiary in accordance with the terms of the indenture.

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 March 31, 2013.

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 March 31, 2013, 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

3 Months Ended

Mar. 31, 2013

ASSET RETIREMENT OBLIGATIONS

(9) 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 quarter 2013 is as follows (in thousands):


	Three Months Ended March 31, 2013

Beginning of period	$ 146,478
Liabilities incurred	1,690
Liabilities settled	(96)
Disposition of wells	(2,816)
Accretion expense	2,717
Change in estimate	-

End of period	147,973
Less current portion	(2,366)

Long-term asset retirement obligations	$ 145,607

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

CAPITAL STOCK

3 Months Ended

Mar. 31, 2013

CAPITAL STOCK

(10) 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 2012:


	Three Months Ended March 31, 2013	Year Ended December 31, 2012

Beginning balance	162,514,098	161,131,547
Stock options/SARs exercised	206,949	926,425
Restricted stock granted	106,969	354,674
Restricted stock units vested	112,751	57,824
Treasury shares issued	26,026	43,628

Ending balance	162,966,793	162,514,098

- 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
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
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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.

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

+ Details

DERIVATIVE ACTIVITIES

3 Months Ended

Mar. 31, 2013

DERIVATIVE ACTIVITIES

(11) 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 swaps or collars to (1) reduce the effect of price volatility of the commodities we produce and sell and (2) support our annual capital budget and expenditure plans. In 2011, we sold NGLs derivative swap contracts (“sold swaps”) for the natural gasoline (or C5) component of natural gas liquids and in 2012, we entered into purchased derivative swaps (“re-purchased swaps”) for C5 volumes. These re-purchased swaps were, in some cases, with the same counterparties as our sold swaps. We entered into these re-purchased swaps to lock in certain natural gasoline derivative gains. In second quarter 2012, we also entered into NGL derivative swap contracts for the propane (or C3) component of NGLs. At March 31, 2013, we had open swap contracts covering 77.7 Bcf of natural gas at prices averaging $3.71 per mcf, 4.5 million barrels of oil at prices averaging $94.62 per barrel, 1.8 million net barrels of NGLs (the C5 component of NGLs) at prices averaging $92.72 per barrel and 2.3 million barrels of NGLs (the C3 component of NGLs) at prices averaging $37.00 per barrel. At March 31, 2013, we also had collars covering 258.6 Bcf of natural gas at weighted average floor and cap prices of $4.08 to $4.64 per mcf and 1.6 million barrels of oil at weighted average floor and cap prices of $88.23 to $100.00 per barrel. The fair value of these contracts, represented by the estimated amount that would be realized upon termination, based on a comparison of the contract price and a reference price, generally the New York Mercantile Exchange (“NYMEX”), approximated a net unrealized pre-tax loss of $593,000 at March 31, 2013. These contracts expire monthly through December 2015. The following table sets forth our derivative volumes by year as of March 31, 2013.


Period	Contract Type	Volume Hedged	Weighted Average Hedge Price


Natural Gas
2013	Collars	280,000 Mmbtu/day	$ 4.59–$ 5.05
2014	Collars	402,500 Mmbtu/day	$ 3.81–$ 4.47
2015	Collars	95,000 Mmbtu/day	$ 4.06–$ 4.48
2013	Swaps	256,127 Mmbtu/day	$ 3.67
2014	Swaps	20,000 Mmbtu/day	$ 4.08

Crude Oil
2013	Collars	3,000 bbls/day	$ 90.60–$ 100.00
2014	Collars	2,000 bbls/day	$ 85.55–$ 100.00
2013	Swaps	5,829 bbls/day	$ 96.73
2014	Swaps	6,000 bbls/day	$ 94.54
2015	Swaps	2,000 bbls day	$ 90.20

NGLs (Natural Gasoline)
2013	Sold Swaps	8,000 bbls/day	$ 89.64
2013	Re-purchased Swaps	1,500 bbls/day	$ 76.30

NGLs (Propane)
2013	Swaps	7,000 bbls/day	$ 36.38
2014	Swaps	1,000 bbls/day	$ 40.32

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 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 March 31, 2013, an unrealized pre-tax derivative gain of $91.9 million was recorded in AOCI. See additional discussion below regarding the discontinuance of hedge accounting. 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 or loss.

For those derivative instruments that qualify or are designated 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 February 28, 2013, 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 $36.5 million of gains in first quarter 2013 compared to gains of $57.6 million in the same period of 2012 related to settled hedging transactions. Any ineffectiveness associated with these hedge derivatives is reflected in derivative fair value loss in the accompanying statements of operations. The ineffective portion is generally calculated as the difference between the changes in fair value of the derivative and the estimated change in future cash flows from the item hedged. Derivative fair value loss for the three months ended March 31, 2013 includes ineffective losses (unrealized and realized) of $2.9 million compared to a gain of $237,000 in the three months ended March 31, 2012. During first quarter 2013, we recognized a pre-tax gain of $2.3 million as a result of the discontinuance of hedge accounting where we determined the transaction was probable not to occur due to the sale of our properties in New Mexico.

Discontinuance of Hedge Accounting

Effective March 1, 2013, we elected to de-designate all commodity contracts that were previously designated as cash flow hedges and elected to discontinue hedge accounting prospectively. AOCI included $103.6 million ($63.2 million after tax) of unrealized net gains, representing the marked-to-market value of the effective portion of our cash flow hedges as of February 28, 2013. As a result of discontinuing hedge accounting, the marked-to-market values included in AOCI as of the de-designation date were frozen and will be reclassified into earnings in future periods as the underlying hedged transactions occur. As of March 31, 2013, we expect to reclassify into earnings $80.9 million of unrealized net gains in the remaining months of 2013 and $10.9 million of unrealized net gains in 2014 from AOCI.

With the election to de-designate hedging instruments, all of our derivative instruments continue to be recorded at fair value with unrealized gains and losses recognized immediately in earnings rather than in AOCI. These marked-to-market adjustments will produce a degree of earnings volatility that can be significant from period to period, but such adjustments will have no cash flow impact relative to changes in market prices. The impact to cash flow occurs upon settlement of the underlying contract.

Derivative fair value loss

The following table presents information about the components of derivative fair value loss for the three months ended March 31, 2013 and 2012 (in thousands):


	Three Months Ended March 31,

	2013	2012

Change in fair value of derivatives that do not qualify or are not designated for hedge accounting (a)	$ (96,802)	$ (52,056 )
Realized gain on settlement–natural gas (a) (b)	815	—
Realized loss on settlement–oil (a) (b)	(102)	(4,622 )
Realized loss on settlement–NGLs (a) (b)	(895)	(4,392 )
Hedge ineffectiveness–realized	564	1,185
–unrealized	(3,455)	(948 )

Derivative fair value loss	$ (99,875)	$ (60,833 )

(a) Derivatives that do not qualify or are not designated for hedge accounting.

(b)These amounts represent the realized gains and losses on settled derivatives that do not qualify or are not designated 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 or are not designated for hedge accounting.

Derivative assets and liabilities

The combined fair value of derivatives included in the accompanying consolidated balance sheets as of March 31, 2013 and December 31, 2012 is summarized below. As of March 31, 2013, we are conducting derivative activities with fifteen 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 (in thousands).


	March 31, 2013	December 31, 2012

Derivative assets:
Natural gas–swaps	$ (12,701)	$ 7,504
–collars	33,552	122,255
–basis swaps	—	993
Crude oil–swaps	1,769	9,650
–collars	(59)	2,222
NGLs–C5 swaps	4,844	10,643
–C3 swaps	34	—

	$ 27,439	$ 153,267

Derivative (liabilities):
Natural gas–swaps	$ (19,918)	$ —
–collars	(6,206)	(3,463)
Crude oil – swaps	2,929	—
NGLs–C5 swaps	3,467	2,275
–C3 swaps	(8,204)	(6,746)

	$ (28,032)	$ (7,934)

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).


	March 31, 2013			December 31, 2012

	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)	$ 15,431	$ (6,640)	$ 8,791	$ 22,236	$ (3,242)	$ 18,994
Collars (a)	91,591	(10,356)	81,235	129,878	(9,721)	120,157

	$ 107,022	$ (16,996)	$ 90,026	$ 152,114	$ (12,963)	$ 139,151

Derivatives that do not qualify for hedge accounting :
Sold swaps (a)	$ 6,702	$ (48,132)	$ (41,430)	$ 7,316	$ (8,904)	$ (1,588)
Re-purchased swaps (a)	4,759	—	4,759	5,920	—	5,920
Collars (a)	162	(54,110)	(53,948)	857	—	857
Basis swaps (a)	—	—	—	993	—	993

	$ 11,623	$ (102,242)	$ (90,619)	$ 15,086	$ (8,904)	$ 6,182

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

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


	Three Months Ended March 31,

	Change in Hedge Derivative Fair Value		Realized Gain (Loss) Reclassified from OCI into Revenue (a)

	2013	2012		2013	2012

Swaps	$ (2,154)	$ 36,172		$ 5,768	$ 19,313
Put options	—	(1,562)		—	—
Collars	(7,015)	96,471		30,732	38,316
Income taxes	3,576	(52,107)		(14,235)	(22,187)

	$ (5,593)	$ 78,974		$ 22,265	$ 35,442

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

losses upon derivative contract settlement, the increase in AOCI is offset by a decrease in natural gas, NGLs and oil sales.

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


	Three Months Ended March 31,

	Gain (Loss) Recognized in Income (Non-hedge Derivatives)		Gain (Loss) Recognized in Income (Ineffective Portion)		Derivative Fair Value Income (Loss)

	2013	2012	2013	2012	2013	2012
Swaps	$ (43,076)	$ (52,985)	$ (1,995)	$ 159	$ (45,071)	$ (52,826)
Re-purchased swaps	1,185	—	—	—	1,185	—
Collars	(55,003)	(2,502)	(896)	78	(55,899)	(2,424)
Call options	(90)	(5,583)	—	—	(90)	(5,583)

Total	$ (96,984)	$ (61,070)	$ (2,891)	$ 237	$ (99,875)	$ (60,833)

Offsetting of Derivative Assets and Derivative Liabilities

The tables below provide additional information related to our master netting arrangements with our derivative counterparties (in thousands):


	March 31, 2013

	Gross Amounts of Recognized Assets	Gross Amounts Offset in the Balance Sheet	Net Amounts of Assets Presented in the Balance Sheet

Derivative assets:
Natural gas – swaps	$ —	$ (12,701)	$ (12,701)
– collars	42,866	(9,314)	33,552
Crude oil – swaps	2,360	(591)	1,769
– collars	444	(503)	(59)
NGLs – C5 swaps	5,084	(240)	4,844
– C3 swaps	34	—	34

	$ 50,788	$ (23,349)	$ 27,439




	Gross Amounts of Recognized (Liabilities)	Gross Amounts Offset in the Balance Sheet	Net Amounts of (Liabilities) Presented in the Balance Sheet

Derivative (liabilities):
Natural gas – swaps	$ (19,918)	$ —	$ (19,918)
– collars	(16,475)	10,269	(6,206)
Crude oil – swaps	(690)	3,520	2,830
NGLs – C5 swaps	(877)	4,343	3,466
– C3 swaps	(8,204)	—	(8,204)

	$ (46,164)	$ 18,132	$ (28,032)


	December 31, 2012

	Gross Amounts of Recognized Assets	Gross Amounts Offset in the Balance Sheet	Net Amounts of Assets Presented in the Balance Sheet

Derivative assets:
Natural gas – swaps	$ 10,746	$ (3,242)	$ 7,504
– collars	127,991	(5,736)	122,255
– basis swaps	993	—	993
Crude oil – swaps	9,650	—	9,650
– collars	2,222	—	2,222
NGLs – C5 swaps	10,674	(31)	10,643

	$ 162,276	$ (9,009)	$ 153,267




	Gross Amounts of Recognized (Liabilities)	Gross Amounts Offset in the Balance Sheet	Net Amounts of (Liabilities) Presented in the Balance Sheet

Derivative (liabilities):
Natural gas – collars	$ (3,883)	$ 420	$ (3,463)
NGLs – C5 swaps	(106)	2,381	2,275
– C3 swaps	(6,746)	—	(6,746)

	$ (10,735)	$ 2,801	$ (7,934)

- 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.

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+ Details

FAIR VALUE MEASUREMENTS

3 Months Ended

Mar. 31, 2013

FAIR VALUE MEASUREMENTS

(12) 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 March 31, 2013 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 March 31, 2013

Trading securities held in the deferred compensation plans	$ 71,440	$ —	$ —	$ 71,440

Derivatives–swaps	—	(27,880)	—	(27,880)
–collars	—	27,287	—	27,287


	Fair Value Measurements at December 31, 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 December 31, 2012

Trading securities held in the deferred compensation plans	$ 57,776	$ —	$ —	$ 57,776

Derivatives–swaps	—	23,326	—	23,326
–collars	—	121,014	—	121,014
–basis swaps	—	993	—	993

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

Our trading securities held in the deferred compensation plan are accounted for using the mark-to-market accounting method and are included in other assets in the accompanying consolidated balance sheets. We elected to adopt the fair value option to simplify our accounting for the investments in our deferred compensation plan. Interest, dividends, and mark-to-market gains or losses are included in deferred compensation plan expense in the accompanying statement of operations. For first quarter 2013, interest and dividends were $40,000 and the mark-to-market adjustment was a gain of $1.6 million. For first quarter 2012, interest and dividends were $62,000 and the mark-to-market adjustment was a gain of $4.0 million.

Fair Values—Reported

The following table presents the carrying amounts and the fair values of our financial instruments as of March 31, 2013 and December 31, 2012 (in thousands):


	March 31, 2013		December 31, 2012

	Carrying Value	Fair Value	Carrying Value	Fair Value

Assets:
Commodity swaps and collars	$ 27,439	$ 27,439	$ 153,267	$ 153,267
Marketable securities(a)	71,440	71,440	57,776	57,776
(Liabilities):
Commodity swaps and collars	(28,032)	(28,032 )	(7,934 )	(7,934 )
Bank credit facility(b)	(47,000 )	(47,000 )	(739,000 )	(739,000 )
Deferred compensation plan	(222,700)	(222,700)	(187,604)	(187,604)
7.25% senior subordinated notes due 2018(b)	(250,000 )	(260,000 )	(250,000 )	(262,500 )
8.00% senior subordinated notes due 2019(b)	(289,505 )	(328,500 )	(289,185 )	(332,250 )
6.75% senior subordinated notes due 2020(b)	(500,000 )	(550,000 )	(500,000 )	(542,500 )
5.75% senior subordinated notes due 2021(b)	(500,000 )	(536,250 )	(500,000 )	(535,000 )
5.00% senior subordinated notes due 2022(b)	(600,000 )	(613,500 )	(600,000 )	(627,000 )
5.00% senior subordinated notes due 2023(b)	(750,000 )	(766,875)	—	—

(a) Marketable securities, which are held in our deferred compensation plans, are actively traded on major exchanges. Refer to Note 13 for additional

information.

(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. Refer to Note 8 for additional information.

Our current assets and liabilities contain financial instruments, the most significant of which are trade accounts receivable and payable. 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 March 31, 2013, 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 $2.4 million at March 31, 2013 and December 31, 2012. As of March 31, 2013, our derivative contracts consist of swaps and collars. 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 March 31, 2013, our derivative counterparties include fifteen financial institutions, of which all but two are secured lenders in our bank credit facility. At March 31, 2013, our net derivative assets include a receivable from the two counterparties not included in our bank credit facility of $3.4 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

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-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 825
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-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)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

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

+ Details

STOCK-BASED COMPENSATION PLANS

3 Months Ended

Mar. 31, 2013

STOCK-BASED COMPENSATION PLANS

(13) 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. Upon grant of these restricted shares, which we refer to as restricted 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. 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 shares and receive dividends thereon. These Liability Awards are classified as a liability and are remeasured at fair value each reporting period. This mark-to-market adjustment is reported in deferred compensation plan expense in the accompanying consolidated statements of operations.

Total Stock-Based Compensation Expense

Stock-based compensation represents amortization of restricted stock grants and SARs expense. In first quarter 2013, stock-based compensation was allocated to operating expense ($661,000), brokered natural gas and marketing expense ($249,000), exploration expense ($1.1 million) and general and administrative expense ($10.3 million) for a total expense of $12.3 million. In first quarter 2012, stock-based compensation was allocated to operating expense ($357,000), brokered natural gas and marketing expense ($453,000), exploration expense ($928,000) and general and administrative expense ($8.2 million) for a total expense of $9.9 million. Unlike the other forms of stock-based compensation mentioned above, the mark-to-market adjustment of the liability related to the vested restricted stock held in our deferred compensation plans is directly tied to the change in our stock price and not directly related to the functional expenses and therefore, is not allocated to the functional categories.

Stock and Option Plans

We have two active equity-based stock plans, the 2005 Plan and the Director Plan. Under these plans, incentive and non-qualified stock options, SARs, restricted stock units and various other awards may be issued to directors and employees pursuant to decisions of the Compensation Committee, which is made up of non-employee, independent directors from the Board of Directors. All awards granted under these plans have been issued at prevailing market prices at the time of the grant. Of the 2.6 million grants outstanding at March 31, 2013, all are 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, 2012	3,433,362	$ 52.52
Granted	116,413	69.23
Exercised	(919,085)	52.52
Expired/forfeited	(36,881)	52.64

Outstanding at March 31, 2013	2,593,809	$ 53.24

Stock Appreciation Right Awards

During first three months 2013, 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:

	Three Months Ended March 31, 2013

Weighted average exercise price per share	$69.23
Expected annual dividends per share	0.23%
Expected life in years	3.7
Expected volatility	34%
Risk-free interest rate	0.6%
Weighted average grant date fair value	$18.41

Restricted Stock Awards

Equity Awards

In first three months 2013, we granted 386,000 restricted stock Equity Awards to employees at an average grant price of $71.02 compared to 356,000 restricted stock Equity Awards granted to employees at an average grant price of $63.37 in the same period of 2012. These awards generally vest over a three-year period. We recorded compensation expense for these Equity Awards of $4.3 million in the first three months 2013 compared to $2.1 million in the same period of 2012. Equity Awards are not issued to employees until they are vested. Employees do not have the option to receive cash.

Liability Awards

In first three months 2013, we granted 125,000 shares of restricted stock Liability Awards as compensation to employees at an average price of $71.40 with vesting generally over a three-year period. In the same period of 2012, we granted 140,000 shares of Liability Awards as compensation to employees at an average price of $63.15 with vesting generally over a three-year period. We recorded compensation expense for Liability Awards of $4.5 million in first three months 2013 compared to $4.2 million in the same period of 2012. Substantially all of these awards are held in our deferred compensation plan, are classified as a liability and are remeasured at fair value each reporting period. This mark-to-market adjustment is reported in the deferred compensation expense in our consolidated statements of operations (see additional discussion below).

A summary of the status of our non-vested restricted stock outstanding at March 31, 2013 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, 2012	349,156	$ 59.08	423,478	$ 58.91
Granted	385,688	71.02	125,236	71.40
Vested	(50,404)	57.06	(86,161)	57.11
Forfeited	(3,523)	57.99	(14,442)	56.78

Outstanding at March 31, 2013	680,917	$ 66.00	448,111	$ 62.82

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 $42.4 million in first quarter 2013 compared to mark-to-market gain of $7.8 million in first quarter 2012. The Rabbi Trust held 2.6 million shares (2.2 million of vested shares) of Range stock at March 31, 2013 compared to 2.7 million shares (2.3 million of vested shares) at December 31, 2012.

- 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
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-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 5: 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=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

3 Months Ended

Mar. 31, 2013

SUPPLEMENTAL CASH FLOW INFORMATION

(14) SUPPLEMENTAL CASH FLOW INFORMATION


	Three Months Ended March 31,

	2013	2012

	(in thousands)
Net cash provided from operating activities included:
Income taxes (refunded) paid to taxing authorities	$ (162)	$ 196
Interest paid	37,541	29,636
Non-cash investing and financing activities included:
Asset retirement costs capitalized, net	1,690	1,194

COMMITMENTS AND CONTINGENCIES

3 Months Ended

Mar. 31, 2013

COMMITMENTS AND CONTINGENCIES

(15) COMMITMENTS AND CONTINGENCIES

Litigation

James A. Drummond and Chris Parrish v. Range Resources-Midcontinent, LLC et al.; pending in the District Court of Grady County, State of Oklahoma; Case No. CJ-2010-510

Two individuals (one of whom is now deceased), only one of which was a current royalty owner, filed suit against Range Resources Corporation and two of our subsidiaries, including the proper defendant Range Resources-Midcontinent, LLC, in the District Court of Grady County, Oklahoma. This suit is similar to a number of cases filed in Oklahoma asserting claims that royalty owners are entitled to payment of royalties on several different categories of alleged “deductions” applied by third parties who transport and process natural gas production. The alleged deductions include fuel used by the third party in the transportation and processing of gas, condensate removed by the third party after the point of sale, the contractually agreed natural gas liquids recovery percentages, the percentage of proceeds contracts’ contractually agreed pricing percentages and other similar alleged “deductions.” In addition to the claims made with respect to the alleged categories of deductions, the Plaintiffs in this litigation have alleged fraud and the existence of a fiduciary duty to the royalty owners to attempt to support an argument that no statute of limitations applies, and the Plaintiffs also claim that interest accrues on the alleged damages at 12% compounded annually. Thus while we cannot reasonably estimate our potential exposure at this time, the damages claimed by the Plaintiffs have been estimated by the Plaintiffs’ counsel to be in excess of $140 million. We believe Oklahoma is a “first marketable product” rule state and the current case law in Oklahoma (principally Mittelstaedt v. Santa Fe) allows operators to deduct value enhancing costs for treating, compression and other post-production expenses incurred to increase the value of a marketable product; however, whether and when gas is a marketable product and the extent to which the deductions are permitted may be fact questions under Oklahoma law. Further, we do not typically transport and process the gas production from wells we operate in Oklahoma but instead sell the gas production to unaffiliated third parties which, in many cases, do transport and process the gas. Range maintains that the alleged “deductions” made the subject of the Plaintiffs’ claims are not deductions at all but the negotiated terms of the contracts with the third parties who buy, transport and process the gas under terms that allow Range and its royalty owners to share in the enhanced downstream value that establishes the purchase price for the production sold by us, and on which we have paid royalty. Range further believes that its production is marketable under Oklahoma law when sold to such unaffiliated third parties. The terms with respect to payment of royalties vary based on the terms of the various oil and gas leases owned by Range for its Oklahoma wells and wells it has owned and operated in Oklahoma in the past, and our subsidiary believes that it has substantially complied with its royalty payment obligations under its leases and we therefore intend to vigorously defend this litigation. As previously disclosed, on February 19, 2013, the District Court entered an order certifying a class of royalty owners as requested by the Plaintiffs. We have appealed the class certification order. In addition, we have received a revised claim of damages by the Plaintiffs which has increased the amount claimed by the Plaintiffs to $160.0 million. We have evaluated the possible financial impact of this litigation, and while we believe we have strong defenses to the claims made in this lawsuit, given our evaluation of the law in Oklahoma, the outcomes in other similar litigation and our assessment of the current status of the litigation, the three months ended March 31, 2013 includes an accrual of $35.0 million which, at this time, we believe is appropriate given the information at this time. We may accrue additional amounts in the future or otherwise adjust this accrual depending upon future developments in the course of this litigation.

We are the subject of, or party to, a number of other 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 quarterly and will establish and adjust any litigation reserves as appropriate to reflect our assessment of the then current status of litigation.

Transportation and Gathering Contracts and Hydraulic Fracturing Services

In first quarter 2013, we recognized rate adjustments on certain existing transportation and gathering contracts which increased our transportation and gathering commitments approximately $63.0 million over the next 10 years. We also extended our commitments for hydraulic fracturing services by $24.0 million in 2014.

- 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

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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

3 Months Ended

Mar. 31, 2013

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization

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


	March 31, 2013	December 31, 2012

	(in thousands)
Natural gas and oil properties:
Properties subject to depletion	$ 7,396,037	$ 7,368,308
Unproved properties	732,163	743,467

Total	8,128,200	8,111,775
Accumulated depreciation, depletion and amortization	(1,944,252)	(2,015,591 )

Net capitalized costs	$ 6,183,948	$ 6,096,184

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

Costs Incurred for Property Acquisition, Exploration and Development

3 Months Ended

Mar. 31, 2013

Costs Incurred for Property Acquisition, Exploration and Development

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

	Three Months Ended March 31, 2013	Year Ended December 31, 2012

	(in thousands)

Acreage purchases	$ 9,394	$ 188,843
Development	309,240	1,049,129
Exploration:
Drilling	70,853	309,816
Expense	15,710	65,758
Stock-based compensation expense	1,070	4,049
Gas gathering facilities:
Development	6,789	41,035

Subtotal	413,056	1,658,630
Asset retirement obligations	1,690	57,982

Total costs incurred	$ 414,746	$ 1,716,612

(a) Includes cost incurred whether capitalized or expensed.

NEW ACCOUNTING STANDARDS (Policies)

3 Months Ended

Mar. 31, 2013

Disclosures about Offsetting Assets and Liabilities

Comprehensive Income

The following table details the components of AOCI and related tax effects for the three months ended March 31, 2013 and March 31, 2012 (in thousands).

	2013				2012

	Gross	Tax Effect	Net of Tax	Gross		Tax Effect	Net of Tax

AOCI at beginning of period	$ 137,555	$ (53,646)	$ 83,909	$ 254,678		$ (98,051)	$ 156,627
Derivative contract settlements reclassified to natural gas, NGLs and oil sales	(24,328)	9,488	(14,840)	(57,629)		22,187	(35,442)
Amortization related to de- designated hedges	(12,172)	4,747	(7,425)	—		—	—
Change in unrealized deferred hedging gains	(9,169)	3,576	(5,593)	131,081		(52,107)	78,974

AOCI at March 31	$ 91,886	$ (35,835)	$ 56,051	$ 328,130		$ (127,971)	$ 200,159

BASIS OF PRESENTATION (Tables)

3 Months Ended

Mar. 31, 2013

Long Lived Assets Held-for-sale

	March 31, 2013

Composition of assets held for sale:
Oil and gas properties	$ 161,140
Transportation and field assets	3
Accounts receivable and other	4,117
Inventory	218

	$ 165,478

Composition of liabilities held for sale:
Accounts payable	$ (354)
Asset retirement obligation	(2,816)
Accrued liabilities	(5,176)
	$ (8,346)

NEW ACCOUNTING STANDARDS (Table)

3 Months Ended

Mar. 31, 2013

Schedule of Accumulated Other Comprehensive Income (Loss)

The following table details the components of AOCI and related tax effects for the three months ended March 31, 2013 and March 31, 2012 (in thousands).

	2013				2012

	Gross	Tax Effect	Net of Tax	Gross		Tax Effect	Net of Tax

AOCI at beginning of period	$ 137,555	$ (53,646)	$ 83,909	$ 254,678		$ (98,051)	$ 156,627
Derivative contract settlements reclassified to natural gas, NGLs and oil sales	(24,328)	9,488	(14,840)	(57,629)		22,187	(35,442)
Amortization related to de- designated hedges	(12,172)	4,747	(7,425)	—		—	—
Change in unrealized deferred hedging gains	(9,169)	3,576	(5,593)	131,081		(52,107)	78,974

AOCI at March 31	$ 91,886	$ (35,835)	$ 56,051	$ 328,130		$ (127,971)	$ 200,159

INCOME TAXES (Tables)

3 Months Ended

Mar. 31, 2013

Income Tax (Benefit) Expense from Continuing Operations

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


	Three Months Ended March 31,

	2013	2012

Income tax benefit	$ (47,180)	$ (27,843)
Effective tax rate	38.4%	40.0 %

INCOME (LOSS) PER COMMON SHARE (Tables)

3 Months Ended

Mar. 31, 2013

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




	Three Months Ended March 31, 2013	Three Months Ended March 31, 2012

Net loss, as reported	$ (75,610)	$ (41,800)
Participating basic earnings (a)	(109)	(113)

Basic net loss attributed to common shareholders	(75,719)	(41,913)
Reallocation of participating earnings (a)	—	—

Diluted net loss attributed to common shareholders	$ (75,719)	$ (41,913)

Net loss per common share:
Basic	$ (0.47)	$ (0.26)
Diluted	$ (0.47)	$ (0.26)

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

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


	Three Months Ended March 31,

	2013	2012

Denominator:
Weighted average common shares outstanding – basic	160,125	158,913
Effect of dilutive securities:
Director and employee stock options and SARs	—	—

Weighted average common shares outstanding – diluted	160,125	158,913

SUSPENDED EXPLORATORY WELL COSTS (Tables)

3 Months Ended

Mar. 31, 2013

Suspended Exploratory Well Costs


	March 31, 2013	December 31, 2012

Balance at beginning of period	$ 57,360	$ 93,388
Additions to capitalized exploratory well costs pending the determination of proved reserves	62,640	153,250
Reclassifications to wells, facilities and equipment based on determination of proved reserves	(58,601)	(184,298)
Divested wells	—	(4,980)

Balance at end of period	61,399	57,360
Less exploratory well costs that have been capitalized for a period of one year or less	(39,140)	(45,965)

Capitalized exploratory well costs that have been capitalized for a period greater than one year	$ 22,259	$ 11,395

Number of projects that have exploratory well costs that have been capitalized for a period greater than one year	9	5

Aging of Capitalized Exploratory Well Costs Suspended more than One Year

The following table provides an aging of capitalized exploratory well costs that have been suspended for more than one year as of March 31, 2013 (in thousands):

	Total	2013	2012	2011	2010	2009	2008

Capitalized exploratory well costs that have been capitalized for more than one year	$ 22,259	$ 5,854	$ 5,961	$ 5,965	$ 72	$ 2,884	$ 1,523

INDEBTEDNESS (Tables)

3 Months Ended

Mar. 31, 2013

Debt Outstanding


	March 31, 2013	December 31, 2012

Bank debt (3.7%)	$ 47,000	$ 739,000
Senior subordinated notes:
7.25% senior subordinated notes due 2018	250,000	250,000
8.00% senior subordinated notes due 2019, net of $10,495 and $10,815 discount, respectively	289,505	289,185
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	600,000
5.00% senior subordinated notes due 2023	750,000	—

Total debt	$ 2,936,505	$ 2,878,185

- 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
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.5-02.22)
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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)

3 Months Ended

Mar. 31, 2013

Asset Retirement Obligations


	Three Months Ended March 31, 2013

Beginning of period	$ 146,478
Liabilities incurred	1,690
Liabilities settled	(96)
Disposition of wells	(2,816)
Accretion expense	2,717
Change in estimate	-

End of period	147,973
Less current portion	(2,366)

Long-term asset retirement obligations	$ 145,607

CAPITAL STOCK (Tables)

3 Months Ended

Mar. 31, 2013

Capital Stock


	Three Months Ended March 31, 2013	Year Ended December 31, 2012

Beginning balance	162,514,098	161,131,547
Stock options/SARs exercised	206,949	926,425
Restricted stock granted	106,969	354,674
Restricted stock units vested	112,751	57,824
Treasury shares issued	26,026	43,628

Ending balance	162,966,793	162,514,098

DERIVATIVE ACTIVITIES (Tables)

3 Months Ended

Mar. 31, 2013

Derivative Volumes Hedged and Average Hedge Prices


Period	Contract Type	Volume Hedged	Weighted Average Hedge Price


Natural Gas
2013	Collars	280,000 Mmbtu/day	$ 4.59–$ 5.05
2014	Collars	402,500 Mmbtu/day	$ 3.81–$ 4.47
2015	Collars	95,000 Mmbtu/day	$ 4.06–$ 4.48
2013	Swaps	256,127 Mmbtu/day	$ 3.67
2014	Swaps	20,000 Mmbtu/day	$ 4.08

Crude Oil
2013	Collars	3,000 bbls/day	$ 90.60–$ 100.00
2014	Collars	2,000 bbls/day	$ 85.55–$ 100.00
2013	Swaps	5,829 bbls/day	$ 96.73
2014	Swaps	6,000 bbls/day	$ 94.54
2015	Swaps	2,000 bbls day	$ 90.20

NGLs (Natural Gasoline)
2013	Sold Swaps	8,000 bbls/day	$ 89.64
2013	Re-purchased Swaps	1,500 bbls/day	$ 76.30

NGLs (Propane)
2013	Swaps	7,000 bbls/day	$ 36.38
2014	Swaps	1,000 bbls/day	$ 40.32

Derivative Fair Value (Loss) Income

The following table presents information about the components of derivative fair value loss for the three months ended March 31, 2013 and 2012 (in thousands):


	Three Months Ended March 31,

	2013	2012

Change in fair value of derivatives that do not qualify or are not designated for hedge accounting (a)	$ (96,802)	$ (52,056 )
Realized gain on settlement–natural gas (a) (b)	815	—
Realized loss on settlement–oil (a) (b)	(102)	(4,622 )
Realized loss on settlement–NGLs (a) (b)	(895)	(4,392 )
Hedge ineffectiveness–realized	564	1,185
–unrealized	(3,455)	(948 )

Derivative fair value loss	$ (99,875)	$ (60,833 )

(a) Derivatives that do not qualify or are not designated for hedge accounting.

Combined Fair Value of Derivatives, by Consolidated Balance Sheets


	March 31, 2013	December 31, 2012

Derivative assets:
Natural gas–swaps	$ (12,701)	$ 7,504
–collars	33,552	122,255
–basis swaps	—	993
Crude oil–swaps	1,769	9,650
–collars	(59)	2,222
NGLs–C5 swaps	4,844	10,643
–C3 swaps	34	—

	$ 27,439	$ 153,267

Derivative (liabilities):
Natural gas–swaps	$ (19,918)	$ —
–collars	(6,206)	(3,463)
Crude oil – swaps	2,929	—
NGLs–C5 swaps	3,467	2,275
–C3 swaps	(8,204)	(6,746)

	$ (28,032)	$ (7,934)

Fair Value of Derivative Contracts by Consolidated Balance Sheets


	March 31, 2013			December 31, 2012

	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)	$ 15,431	$ (6,640)	$ 8,791		$ 22,236	$ (3,242)	$ 18,994
Collars (a)	91,591	(10,356)	81,235		129,878	(9,721)	120,157

	$ 107,022	$ (16,996)	$ 90,026		$ 152,114	$ (12,963)	$ 139,151

Derivatives that do not qualify for hedge accounting :
Sold swaps (a)	$ 6,702	$ (48,132)	$ (41,430)		$ 7,316	$ (8,904)	$ (1,588)
Re-purchased swaps (a)	4,759	—	4,759		5,920	—	5,920
Collars (a)	162	(54,110)	(53,948)		857	—	857
Basis swaps (a)	—	—	—		993	—	993

	$ 11,623	$ (102,242)	$ (90,619)		$ 15,086	$ (8,904)	$ 6,182

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

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


	Three Months Ended March 31,

	Change in Hedge Derivative Fair Value		Realized Gain (Loss) Reclassified from OCI into Revenue (a)

	2013	2012		2013	2012

Swaps	$ (2,154)	$ 36,172		$ 5,768	$ 19,313
Put options	—	(1,562)		—	—
Collars	(7,015)	96,471		30,732	38,316
Income taxes	3,576	(52,107)		(14,235)	(22,187)

	$ (5,593)	$ 78,974		$ 22,265	$ 35,442

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

losses upon derivative contract settlement, the increase in AOCI is offset by a decrease in natural gas, NGLs and oil sales.

Effects of Non-Hedge Derivatives on Consolidated Statements of Operations


	Three Months Ended March 31,

	Gain (Loss) Recognized in Income (Non-hedge Derivatives)		Gain (Loss) Recognized in Income (Ineffective Portion)		Derivative Fair Value Income (Loss)

	2013	2012	2013	2012	2013	2012
Swaps	$ (43,076)	$ (52,985)	$ (1,995)	$ 159	$ (45,071)	$ (52,826)
Re-purchased swaps	1,185	—	—	—	1,185	—
Collars	(55,003)	(2,502)	(896)	78	(55,899)	(2,424)
Call options	(90)	(5,583)	—	—	(90)	(5,583)

Total	$ (96,984)	$ (61,070)	$ (2,891)	$ 237	$ (99,875)	$ (60,833)

Schedule Of Derivative Off setting Assets and Liabilities Table Text Block

The tables below provide additional information related to our master netting arrangements with our derivative counterparties (in thousands):


	March 31, 2013

	Gross Amounts of Recognized Assets	Gross Amounts Offset in the Balance Sheet	Net Amounts of Assets Presented in the Balance Sheet

Derivative assets:
Natural gas – swaps	$ —	$ (12,701)	$ (12,701)
– collars	42,866	(9,314)	33,552
Crude oil – swaps	2,360	(591)	1,769
– collars	444	(503)	(59)
NGLs – C5 swaps	5,084	(240)	4,844
– C3 swaps	34	—	34

	$ 50,788	$ (23,349)	$ 27,439




	Gross Amounts of Recognized (Liabilities)	Gross Amounts Offset in the Balance Sheet	Net Amounts of (Liabilities) Presented in the Balance Sheet

Derivative (liabilities):
Natural gas – swaps	$ (19,918)	$ —	$ (19,918)
– collars	(16,475)	10,269	(6,206)
Crude oil – swaps	(690)	3,520	2,830
NGLs – C5 swaps	(877)	4,343	3,466
– C3 swaps	(8,204)	—	(8,204)

	$ (46,164)	$ 18,132	$ (28,032)


	December 31, 2012

	Gross Amounts of Recognized Assets	Gross Amounts Offset in the Balance Sheet	Net Amounts of Assets Presented in the Balance Sheet

Derivative assets:
Natural gas – swaps	$ 10,746	$ (3,242)	$ 7,504
– collars	127,991	(5,736)	122,255
– basis swaps	993	—	993
Crude oil – swaps	9,650	—	9,650
– collars	2,222	—	2,222
NGLs – C5 swaps	10,674	(31)	10,643

	$ 162,276	$ (9,009)	$ 153,267




	Gross Amounts of Recognized (Liabilities)	Gross Amounts Offset in the Balance Sheet	Net Amounts of (Liabilities) Presented in the Balance Sheet

Derivative (liabilities):
Natural gas – collars	$ (3,883)	$ 420	$ (3,463)
NGLs – C5 swaps	(106)	2,381	2,275
– C3 swaps	(6,746)	—	(6,746)

	$ (10,735)	$ 2,801	$ (7,934)

- Definition

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

+ References

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+ Details

FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2013

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


	Fair Value Measurements at March 31, 2013 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 March 31, 2013

Trading securities held in the deferred compensation plans	$ 71,440	$ —	$ —	$ 71,440

Derivatives–swaps	—	(27,880)	—	(27,880)
–collars	—	27,287	—	27,287


	Fair Value Measurements at December 31, 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 December 31, 2012

Trading securities held in the deferred compensation plans	$ 57,776	$ —	$ —	$ 57,776

Derivatives–swaps	—	23,326	—	23,326
–collars	—	121,014	—	121,014
–basis swaps	—	993	—	993

Carrying Amounts and Fair Values of Financial Instruments

Fair Values—Reported

The following table presents the carrying amounts and the fair values of our financial instruments as of March 31, 2013 and December 31, 2012 (in thousands):


	March 31, 2013		December 31, 2012

	Carrying Value	Fair Value	Carrying Value	Fair Value

Assets:
Commodity swaps and collars	$ 27,439	$ 27,439	$ 153,267	$ 153,267
Marketable securities(a)	71,440	71,440	57,776	57,776
(Liabilities):
Commodity swaps and collars	(28,032)	(28,032 )	(7,934 )	(7,934 )
Bank credit facility(b)	(47,000 )	(47,000 )	(739,000 )	(739,000 )
Deferred compensation plan	(222,700)	(222,700)	(187,604)	(187,604)
7.25% senior subordinated notes due 2018(b)	(250,000 )	(260,000 )	(250,000 )	(262,500 )
8.00% senior subordinated notes due 2019(b)	(289,505 )	(328,500 )	(289,185 )	(332,250 )
6.75% senior subordinated notes due 2020(b)	(500,000 )	(550,000 )	(500,000 )	(542,500 )
5.75% senior subordinated notes due 2021(b)	(500,000 )	(536,250 )	(500,000 )	(535,000 )
5.00% senior subordinated notes due 2022(b)	(600,000 )	(613,500 )	(600,000 )	(627,000 )
5.00% senior subordinated notes due 2023(b)	(750,000 )	(766,875)	—	—

(a) Marketable securities, which are held in our deferred compensation plans, are actively traded on major exchanges. Refer to Note 13 for additional

information.

- 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.

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-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)

3 Months Ended

Mar. 31, 2013

Stock Option and SARs Activities


	Shares	Weighted Average Exercise Price

Outstanding at December 31, 2012	3,433,362	$ 52.52
Granted	116,413	69.23
Exercised	(919,085)	52.52
Expired/forfeited	(36,881)	52.64

Outstanding at March 31, 2013	2,593,809	$ 53.24

Weighted Average Grant Date Fair Value of SARs

	Three Months Ended March 31, 2013

Weighted average exercise price per share	$69.23
Expected annual dividends per share	0.23%
Expected life in years	3.7
Expected volatility	34%
Risk-free interest rate	0.6%
Weighted average grant date fair value	$18.41

Restricted Stock and Restricted Stock Units Outstanding

A summary of the status of our non-vested restricted stock outstanding at March 31, 2013 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, 2012	349,156	$ 59.08	423,478	$ 58.91
Granted	385,688	71.02	125,236	71.40
Vested	(50,404)	57.06	(86,161)	57.11
Forfeited	(3,523)	57.99	(14,442)	56.78

Outstanding at March 31, 2013	680,917	$ 66.00	448,111	$ 62.82

SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

3 Months Ended

Mar. 31, 2013

Supplemental Cash Flow Information


	Three Months Ended March 31,

	2013	2012

	(in thousands)
Net cash provided from operating activities included:
Income taxes (refunded) paid to taxing authorities	$ (162)	$ 196
Interest paid	37,541	29,636
Non-cash investing and financing activities included:
Asset retirement costs capitalized, net	1,690	1,194

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

3 Months Ended

Mar. 31, 2013

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization


	March 31, 2013	December 31, 2012

	(in thousands)
Natural gas and oil properties:
Properties subject to depletion	$ 7,396,037	$ 7,368,308
Unproved properties	732,163	743,467

Total	8,128,200	8,111,775
Accumulated depreciation, depletion and amortization	(1,944,252)	(2,015,591 )

Net capitalized costs	$ 6,183,948	$ 6,096,184

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

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

3 Months Ended

Mar. 31, 2013

Costs Incurred for Property Acquisition, Exploration and Development

	Three Months Ended March 31, 2013	Year Ended December 31, 2012

	(in thousands)

Acreage purchases	$ 9,394	$ 188,843
Development	309,240	1,049,129
Exploration:
Drilling	70,853	309,816
Expense	15,710	65,758
Stock-based compensation expense	1,070	4,049
Gas gathering facilities:
Development	6,789	41,035

Subtotal	413,056	1,658,630
Asset retirement obligations	1,690	57,982

Total costs incurred	$ 414,746	$ 1,716,612

(a) Includes cost incurred whether capitalized or expensed.

- Definition

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

+ References + Details

Basis of Presentation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Feb. 26, 2013
Basis Of Presentation [Line Items]
Retroactive Impact Fee		$ 24.0
Period related to annual impact fee per well drilled	15 years
Unrealized gain on commodity derivative contracts	$ 81.4
Permian Basin Assets
Basis Of Presentation [Line Items]
Agreed upon sales price of Permian Basin properties			$ 275.0

Basis of Presentation - (Detail) $ in Thousands	Mar. 31, 2013 USD ($)
Composition of assets held for sale:
Assets held for sale	$ 165,478
Composition of liabilities held for sale:
Liabilities held for sale	(8,346)
Oil and Gas Properties
Composition of assets held for sale:
Assets held for sale	161,140
Transportation And Field
Composition of assets held for sale:
Assets held for sale	3
Accounts Receivable
Composition of assets held for sale:
Assets held for sale	4,117
Oil Inventory
Composition of assets held for sale:
Assets held for sale	218
Accounts Payable
Composition of liabilities held for sale:
Liabilities held for sale	(354)
Asset Retirement Obligation Costs
Composition of liabilities held for sale:
Liabilities held for sale	(2,816)
Accrued Liabilities
Composition of liabilities held for sale:
Liabilities held for sale	$ (5,176)

New Accounting Standards - Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accumulated Other Comprehensive Income [Line Items]
AOCI at beginning of period, gross	$ 137,555	$ 254,678
Derivative contract settlements reclassified to natural gas, NGLs and oil sales, gross	(24,328)	(57,629)
Amortization related to de-designated hedges, gross	(12,172)
Change in unrealized deferred hedging gains, gross	(9,169)	131,081
AOCI at March 31, gross	91,886	328,130
AOCI at beginning of period, tax effect	(53,646)	(98,051)
Derivative contract settlements reclassified to natural gas, NGLs and oil sales, tax effect	9,488	22,187
Amortization related to de-designated hedges, tax effect	4,747
Change in unrealized deferred hedging gains, tax	3,576	(52,107)
AOCI at March 31, tax effect	(35,835)	(127,971)
AOCI at beginning of period, net of tax	83,909	156,627
Derivative contract settlements reclassified to natural gas, NGLs and oil sales, net of tax	(14,840)	(35,442)
Amortization related to de-designated hedges, net of tax	(7,425)
Change in unrealized deferred hedging gains, net of tax	(5,593)	78,974
AOCI at March 31, net of tax	$ 56,051	$ 200,159

Dispositions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Feb. 26, 2013
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain (Loss) on sale of oil and gas properties	$ (166)	$ (10,426)
Proceeds from disposal of assets	38,196	9,852
Permian Basin Assets
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Agreed upon sales price of Permian Basin properties			$ 275,000
Expected gain on disposition	84,000
Proceeds from disposal of assets	27,500
East Texas
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain (Loss) on sale of oil and gas properties		$ (10,900)
Sale of oil and gas properties		75.00%
Proceeds from disposal of assets		$ 8,600
Overriding royalty in the prospect minimum		2.50%
Overriding royalty in the prospect maximum		5.00%
Pennsylvania
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from disposal of assets	$ 10,000

Income Taxes - Income Tax (Benefit) Expense From Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Tax Expense Benefit [Line Items]
Income tax benefit	$ (47,180)	$ (27,843)
Effective tax rate	38.40%	40.00%

Income Taxes - Additional Information (Detail)	3 Months Ended
Income Taxes - Additional Information (Detail)	Mar. 31, 2013	Mar. 31, 2012
Income Taxes [Line Items]
Statutory Tax Rate	35.00%	35.00%

Income (Loss) Per Common Share - Additional Information (Detail) - shares shares in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock appreciation rights excluded from earning per share calculation	2.7	2.8

- 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

Income (Loss) Per Common Share - Computations of Basic and Diluted (Loss) Income Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

Mar. 31, 2013

Mar. 31, 2012

Net loss, as reported

$ (75,610)

$ (41,800)

Participating basic earnings

^[1]

(109)

(113)

Basic net loss attributed to common shareholders

(75,719)

(41,913)

Reallocation of participating earnings

^[1]

Diluted net loss attributed to common shareholders

$ (75,719)

$ (41,913)

Net loss per common share:

Basic

$ (0.47)

$ (0.26)

Diluted

$ (0.47)

$ (0.26)

[1]

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.

- Definition

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

+ References

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

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

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

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

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

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

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

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

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

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

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

+ Details

- Definition

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

+ References + Details

- Definition

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

+ References

+ Details

Income (Loss) Per Common Share - Basic Weighted Average Common Shares Outstanding to Diluted Weighted Average Common Shares Outstanding (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Denominator:
Weighted average common shares outstanding – basic	160,125	158,913
Effect of dilutive securities:
Director and employee stock options and SARs
Weighted average common shares outstanding – diluted	160,125	158,913

- Definition

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

+ References + Details

- Definition

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

+ References

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

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

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

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

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

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

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

+ Details

Suspended Exploratory Well Costs - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2013 USD ($) Well	Mar. 31, 2012	Dec. 31, 2012 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Capitalized exploratory well costs that have been capitalized for more than one year \| $	$ 22,259		$ 11,395
Number of wells waiting on pipeline	6
Number of wells in completion stage	3
Number of wells not operated	5
Pennsylvania
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of wells in marcellus shale area	8
East Texas
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale of oil and gas properties		75.00%

Suspended Exploratory Well Costs - Suspended Exploratory Well Costs (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2013 USD ($) Project	Dec. 31, 2012 USD ($) Project
Exploratory Wells Drilled [Line Items]
Balance at beginning of period	$ 57,360	$ 93,388
Additions to capitalized exploratory well costs pending the determination of proved reserves	62,640	153,250
Reclassifications to wells, facilities and equipment based on determination of proved reserves	(58,601)	(184,298)
Divested wells		(4,980)
Balance at end of period	61,399	57,360
Less exploratory well costs that have been capitalized for a period of one year or less	(39,140)	(45,965)
Capitalized exploratory well costs that have been capitalized for more than one year	$ 22,259	$ 11,395
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year \| Project	9	5

Suspended Exploratory Well Costs - Aging of Capitalized Exploratory Well Costs Suspended more than One Year (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009	Mar. 31, 2008
Aging Of Capitalized Exploratory Well Costs [Line Items]
Capitalized exploratory well costs that have been capitalized for more than one year	$ 22,259	$ 11,395
Exploratory Well Costs Capitalized In Year Two Thousand And Thirteen
Aging Of Capitalized Exploratory Well Costs [Line Items]
Capitalized exploratory well costs that have been capitalized for more than one year	$ 5,854
Exploratory Well Costs Capitalized In Year Two Thousand And Twelve
Aging Of Capitalized Exploratory Well Costs [Line Items]
Capitalized exploratory well costs that have been capitalized for more than one year			$ 5,961
Exploratory Well Costs Capitalized In Year Two Thousand And Eleven
Aging Of Capitalized Exploratory Well Costs [Line Items]
Capitalized exploratory well costs that have been capitalized for more than one year				$ 5,965
Exploratory Well Costs Capitalized In Year Two Thousand And Ten
Aging Of Capitalized Exploratory Well Costs [Line Items]
Capitalized exploratory well costs that have been capitalized for more than one year					$ 72
Exploratory Well Costs Capitalized In Year Two Thousand And Nine
Aging Of Capitalized Exploratory Well Costs [Line Items]
Capitalized exploratory well costs that have been capitalized for more than one year						$ 2,884
Exploratory Well Costs Capitalized In Year Two Thousand And Eight
Aging Of Capitalized Exploratory Well Costs [Line Items]
Capitalized exploratory well costs that have been capitalized for more than one year							$ 1,523

Indebtedness - Debt Outstanding (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Bank debt	$ 47,000	$ 739,000
Subordinated debt	2,889,505	2,139,185
Total debt	2,936,505	2,878,185
7.25% Senior Subordinated notes due 2018
Debt Instrument [Line Items]
Subordinated debt	250,000	250,000
8.00% Senior Subordinated notes due 2019
Debt Instrument [Line Items]
Subordinated debt	289,505	289,185
6.75% Senior Subordinated notes due 2020
Debt Instrument [Line Items]
Subordinated debt	500,000	500,000
5.75% Senior Subordinated notes due 2021
Debt Instrument [Line Items]
Subordinated debt	500,000	500,000
5.00% Senior Subordinated notes due 2022
Debt Instrument [Line Items]
Subordinated debt	600,000	$ 600,000
5.00% Senior Subordinated notes due 2023
Debt Instrument [Line Items]
Subordinated debt	$ 750,000

Indebtedness - Debt Outstanding (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Bank debt percentage	3.70%	3.70%
8.00% Senior Subordinated notes due 2019
Debt Instrument [Line Items]
Discount on Senior Subordinated notes	$ 10,495	$ 10,815
Interest rate on senior subordinated notes	8.00%	8.00%
7.25% Senior Subordinated notes due 2018
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	7.25%	7.25%
6.75% Senior Subordinated notes due 2020
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	6.75%	6.75%
5.75% Senior Subordinated notes due 2021
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	5.75%	5.75%
5.00% Senior Subordinated notes due 2022
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	5.00%	5.00%
5.00% Senior Subordinated notes due 2023
Debt Instrument [Line Items]
Discount on Senior Subordinated notes	$ 11,200
Interest rate on senior subordinated notes	5.00%	5.00%

Indebtedness - Additional Information (Detail)	1 Months Ended	3 Months Ended
Indebtedness - Additional Information (Detail)	Apr. 30, 2013 USD ($)	Mar. 31, 2013 USD ($) Ratio CommercialBank	Mar. 31, 2012 USD ($)	Apr. 08, 2013 USD ($)	Dec. 31, 2012 USD ($)
Debt Instrument [Line Items]
Interest capitalized during the period		$ 0	$ 0
Bank Credit facility, Facility amount		1,750,000,000		$ 1,750,000,000
Bank Credit facility, Borrowing base		$ 2,000,000,000		$ 2,000,000,000
Percentage holding of commercial banks, Maximum		9.00%
Number of commercial banks included in current bank group \| CommercialBank		28
Notice period for increase in facility amount		20 days
Bank debt		$ 47,000,000			$ 739,000,000
Undrawn letters of credit		84,700,000
Borrowing capacity available under the facility amount		$ 1,600,000,000
Maturity date of loan		Feb. 18, 2016
Weighted average interest rate on the bank credit facility		2.10%	2.10%
Commitment fee		0.375%
Interest rate margin on LIBOR loans		1.50%
Interest rate margin on base rate loans		0.50%
Issuance of subordinated notes		$ 750,000,000	$ 600,000,000
Purchase price of senior subordinate notes as a percentage of principal		101.00%
5.00% Senior Subordinated notes due 2023
Debt Instrument [Line Items]
Aggregate principal amount of senior subordinated notes		$ 750,000,000
Interest rate on senior subordinated notes		5.00%			5.00%
Issuance of subordinated notes		$ 738,800,000
Discount on Senior Subordinated notes		$ 11,200,000
7.25% Senior Subordinated notes due 2018
Debt Instrument [Line Items]
Interest rate on senior subordinated notes		7.25%			7.25%
Announced call for redemption amount of debt	$ 250,000,000
Debt redemption price percent of par	103.625%
Senior note redeemed in March 15, 2018 \| 5.00% Senior Subordinated notes due 2023
Debt Instrument [Line Items]
Maximum redemption price of notes as percentage of principal amount		102.50%
Senior note redeemed in March 15, 2021 \| 5.00% Senior Subordinated notes due 2023
Debt Instrument [Line Items]
Maximum redemption price of notes as percentage of principal amount		100.00%
Senior note redeemed in March 15, 2016 \| 5.00% Senior Subordinated notes due 2023
Debt Instrument [Line Items]
Maximum redemption price of notes as percentage of principal amount		105.00%
Maximum percentage of original aggregate amount of notes that can be redeemed		35.00%
Minimum percentage of original aggregate principal amount of notes to remain outstanding immediately after redemption		65.00%
Maximum number of days after the date of the closing of the equity offering that the redemption should occur		60 days
Minimum
Debt Instrument [Line Items]
Spread for Alternate Base Rate		0.50%
Spread for LIBOR Rate		1.50%
Annual rate of commitment fee paid on the undrawn balance		0.375%
Ratio of debt to EBITDAX \| Ratio		1.0
Current ratio \| Ratio		1.0
Maximum
Debt Instrument [Line Items]
Spread for Alternate Base Rate		1.50%
Spread for LIBOR Rate		2.50%
Annual rate of commitment fee paid on the undrawn balance		0.50%
Ratio of debt to EBITDAX \| Ratio		4.25
Current ratio \| Ratio		1.0

Asset Retirement Obligations - Asset Retirement Obligations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Asset Retirement Obligations [Line Items]
Beginning of period	$ 146,478
Liabilities incurred	1,690
Liabilities settled	(96)
Disposition of wells	(2,816)
Accretion expense	2,717
Change in estimate	0
End of period	147,973
Less current portion	(2,366)	$ (2,470)
Long-term asset retirement obligations	$ 145,607

Capital Stock - Capital Stock (Detail) - shares	3 Months Ended	12 Months Ended
Capital Stock - Capital Stock (Detail) - shares	Mar. 31, 2013	Dec. 31, 2012
Equity [Line Items]
Beginning balance	162,514,098	161,131,547
Stock options/SARs exercised	206,949	926,425
Restricted stock granted	106,969	354,674
Restricted stock units vested	112,751	57,824
Treasury shares issued	26,026	43,628
Ending balance	162,966,793	162,514,098

Capital Stock - Additional Information (Detail) - shares	Mar. 31, 2013	Dec. 31, 2012
Equity [Line Items]
Authorized capital stock	485,000,000	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 - Derivative Fair Value (Loss) Income (Detail) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2013

Mar. 31, 2012

Derivatives Fair Value [Line Items]

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

^[1]

$ (96,802)

$ (52,056)

Realized gain (loss) on settlement–natural gas

^[1],[2]

815

Realized gain (loss) on settlement–oil

^[1],[2]

(102)

(4,622)

Realized gain (loss) on settlement–NGLs

^[1],[2]

(895)

(4,392)

Hedge ineffectiveness–realized

564

1,185

Hedge ineffectiveness-unrealized

(3,455)

(948)

Derivative fair value loss

$ (99,875)

$ (60,833)

[1]	Derivatives that do not qualify or are not designated for hedge accounting.
[2]	These amounts represent the realized gains and losses on settled derivatives that do not qualify or are not designated 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 or are not designated for hedge accounting.

Derivative Activities - Combined Fair Value of Derivatives by Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Derivatives Fair Value [Line Items]
Derivative assets	$ 27,439	$ 153,267
Derivative liabilities	(28,032)	(7,934)
Natural gas \| Swap
Derivatives Fair Value [Line Items]
Derivative assets	(12,701)	7,504
Derivative liabilities	(19,918)
Natural gas \| Collars
Derivatives Fair Value [Line Items]
Derivative assets	33,552	122,255
Derivative liabilities	(6,206)	(3,463)
Natural gas \| Basis Swaps
Derivatives Fair Value [Line Items]
Derivative assets		993
Crude oil \| Swap
Derivatives Fair Value [Line Items]
Derivative assets	1,769	9,650
Derivative liabilities	2,929
Crude oil \| Collars
Derivatives Fair Value [Line Items]
Derivative assets	(59)	2,222
Swap NGLs (Natural Gasoline) \| C5 swaps
Derivatives Fair Value [Line Items]
Derivative assets	4,844	10,643
Derivative liabilities	3,467	2,275
Swap NGLs (Natural Gasoline) \| C3 swaps
Derivatives Fair Value [Line Items]
Derivative assets	34
Derivative liabilities	$ (8,204)	$ (6,746)

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

Mar. 31, 2013

Dec. 31, 2012

Derivatives Fair Value [Line Items]

Assets Carrying Value

$ 107,022

$ 152,114

Liabilities Carrying Value

(16,996)

(12,963)

Net Carrying Value

90,026

139,151

Assets Carrying Value

11,623

15,086

Liabilities Carrying Value

(102,242)

(8,904)

Net Carrying Value

(90,619)

6,182

Swap

Derivatives Fair Value [Line Items]

Assets Carrying Value

^[1]

15,431

22,236

Liabilities Carrying Value

^[1]

(6,640)

(3,242)

Net Carrying Value

^[1]

8,791

18,994

Collars

Derivatives Fair Value [Line Items]

Assets Carrying Value

^[1]

91,591

129,878

Liabilities Carrying Value

^[1]

(10,356)

(9,721)

Net Carrying Value

^[1]

81,235

120,157

Assets Carrying Value

^[1]

162

857

Liabilities Carrying Value

^[1]

(54,110)

Net Carrying Value

^[1]

(53,948)

857

Sold Swap

Derivatives Fair Value [Line Items]

Assets Carrying Value

^[1]

6,702

7,316

Liabilities Carrying Value

^[1]

(48,132)

(8,904)

Net Carrying Value

^[1]

(41,430)

(1,588)

Re-purchased swaps

Derivatives Fair Value [Line Items]

Assets Carrying Value

^[1]

4,759

5,920

Net Carrying Value

^[1]

$ 4,759

5,920

Basis Swap

Derivatives Fair Value [Line Items]

Assets Carrying Value

^[1]

993

Net Carrying Value

^[1]

$ 993

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

Derivative Activities - Effects of Cash Flow Hedges and Other Hedges on Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments Gain Loss [Line Items]
Change in Hedge Derivative Fair Value	$ (9,169)	$ 131,081
Change in unrealized deferred hedging gains, tax effect	3,576	(52,107)
Realized Gain Reclassified from AOCI into Revenue, Income taxes	(14,235)	(22,187)
Change in unrealized deferred hedging (losses) gains, net of taxes	(5,593)	78,974
Realized gain on hedge derivative contract settlements reclassified into earnings from other comprehensive income, net of taxes	22,265	35,442
Swap
Derivative Instruments Gain Loss [Line Items]
Change in Hedge Derivative Fair Value	(2,154)	36,172
Realized Gain (Loss) Reclassified from OCI into Revenue	5,768	19,313
Put Option
Derivative Instruments Gain Loss [Line Items]
Change in Hedge Derivative Fair Value		(1,562)
Collars
Derivative Instruments Gain Loss [Line Items]
Change in Hedge Derivative Fair Value	(7,015)	96,471
Realized Gain (Loss) Reclassified from OCI into Revenue	$ 30,732	$ 38,316

Derivative Activities - Effects of Non-Hedge Derivatives on Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Financial Instruments [Line Items]
Gain (Loss) Recognized in Income (Non-hedge Derivatives)	$ (96,984)	$ (61,070)
Gain (Loss) Recognized in Income (Ineffective Portion)	(2,891)	237
Derivative Fair Value Income (Loss)	(99,875)	(60,833)
Swap
Derivative Financial Instruments [Line Items]
Gain (Loss) Recognized in Income (Non-hedge Derivatives)	(43,076)	(52,985)
Gain (Loss) Recognized in Income (Ineffective Portion)	(1,995)	159
Derivative Fair Value Income (Loss)	(45,071)	(52,826)
Purchased Swaps
Derivative Financial Instruments [Line Items]
Gain (Loss) Recognized in Income (Non-hedge Derivatives)	1,185
Derivative Fair Value Income (Loss)	1,185
Collars
Derivative Financial Instruments [Line Items]
Gain (Loss) Recognized in Income (Non-hedge Derivatives)	(55,003)	(2,502)
Gain (Loss) Recognized in Income (Ineffective Portion)	(896)	78
Derivative Fair Value Income (Loss)	(55,899)	(2,424)
Call Option
Derivative Financial Instruments [Line Items]
Gain (Loss) Recognized in Income (Non-hedge Derivatives)	(90)	(5,583)
Derivative Fair Value Income (Loss)	$ (90)	$ (5,583)

Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Detail)	Mar. 31, 2013 MMBTU bbl $ / MMBTU $ / bbl
Collars \| Natural Gas 2013
Derivative [Line Items]
Volume Hedged \| MMBTU	280,000
Average floor price \| $ / MMBTU	4.59
Average cap price \| $ / MMBTU	5.05
Collars \| Natural Gas 2014
Derivative [Line Items]
Volume Hedged \| MMBTU	402,500
Average floor price \| $ / MMBTU	3.81
Average cap price \| $ / MMBTU	4.47
Collars \| Natural Gas 2015
Derivative [Line Items]
Volume Hedged \| MMBTU	95,000
Average floor price \| $ / MMBTU	4.06
Average cap price \| $ / MMBTU	4.48
Collars \| Crude Oil 2013
Derivative [Line Items]
Volume Hedged \| bbl	3,000
Average floor price	90.60
Average cap price	100.00
Collars \| Crude Oil 2014
Derivative [Line Items]
Volume Hedged \| bbl	2,000
Average floor price	85.55
Average cap price	100.00
Swaps \| Natural Gas 2013
Derivative [Line Items]
Volume Hedged \| MMBTU	256,127
Average hedge price \| $ / MMBTU	3.67
Swaps \| Natural Gas 2014
Derivative [Line Items]
Volume Hedged \| MMBTU	20,000
Average hedge price \| $ / MMBTU	4.08
Swaps \| Crude Oil 2013
Derivative [Line Items]
Volume Hedged \| bbl	5,829
Average hedge price	96.73
Swaps \| Crude Oil 2014
Derivative [Line Items]
Volume Hedged \| bbl	6,000
Average hedge price	94.54
Swaps \| Crude Oil 2015
Derivative [Line Items]
Volume Hedged \| bbl	2,000
Average hedge price	90.20
Swaps \| NGLs Propane 2013
Derivative [Line Items]
Volume Hedged \| bbl	7,000
Average hedge price	36.38
Swaps \| NGLs Propane 2014
Derivative [Line Items]
Volume Hedged \| bbl	1,000
Average hedge price	40.32
Sold Swap \| NGLs Natural Gasoline 2013
Derivative [Line Items]
Volume Hedged \| bbl	8,000
Average hedge price	89.64
Re-purchased Swaps \| NGLs Natural Gasoline 2013
Derivative [Line Items]
Volume Hedged \| bbl	1,500
Average hedge price	76.30

Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Derivative Financial Instruments, Liabilities
Derivative [Line Items]
Gross Amounts Offset in the Balance Sheet	$ 18,132	$ 2,801
Gross Amounts of Recognized (Liabilities)	(46,164)	(10,735)
Net Amounts of (Liabilities) Presented in the Balance Sheet	(28,032)	(7,934)
Natural gas \| Swap \| Derivative Financial Instruments, Liabilities
Derivative [Line Items]
Gross Amounts of Recognized (Liabilities)	(19,918)
Net Amounts of (Liabilities) Presented in the Balance Sheet	(19,918)
Natural gas \| Collars \| Derivative Financial Instruments, Liabilities
Derivative [Line Items]
Gross Amounts Offset in the Balance Sheet	10,269	420
Gross Amounts of Recognized (Liabilities)	(16,475)	(3,883)
Net Amounts of (Liabilities) Presented in the Balance Sheet	(6,206)	(3,463)
Crude oil \| Swap \| Derivative Financial Instruments, Liabilities
Derivative [Line Items]
Gross Amounts Offset in the Balance Sheet	3,520
Gross Amounts of Recognized (Liabilities)	(690)
Net Amounts of (Liabilities) Presented in the Balance Sheet	2,830
Swap NGLs (Natural Gasoline) \| C5 swaps \| Derivative Financial Instruments, Liabilities
Derivative [Line Items]
Gross Amounts Offset in the Balance Sheet	4,343	2,381
Gross Amounts of Recognized (Liabilities)	(877)	(106)
Net Amounts of (Liabilities) Presented in the Balance Sheet	3,466	2,275
Swap NGLs (Natural Gasoline) \| C3 swaps \| Derivative Financial Instruments, Liabilities
Derivative [Line Items]
Gross Amounts of Recognized (Liabilities)	(8,204)	(6,746)
Net Amounts of (Liabilities) Presented in the Balance Sheet	(8,204)	(6,746)
Derivative Financial Instruments, Assets
Derivative [Line Items]
Gross Amounts of Recognized Assets	50,788	162,276
Gross Amounts Offset in the Balance Sheet	(23,349)	(9,009)
Net Amounts of Assets Presented in theBalance Sheet	27,439	153,267
Derivative Financial Instruments, Assets \| Natural gas \| Swap
Derivative [Line Items]
Gross Amounts of Recognized Assets		10,746
Gross Amounts Offset in the Balance Sheet	(12,701)	(3,242)
Net Amounts of Assets Presented in theBalance Sheet	(12,701)	7,504
Derivative Financial Instruments, Assets \| Natural gas \| Collars
Derivative [Line Items]
Gross Amounts of Recognized Assets	42,866	127,991
Gross Amounts Offset in the Balance Sheet	(9,314)	(5,736)
Net Amounts of Assets Presented in theBalance Sheet	33,552	122,255
Derivative Financial Instruments, Assets \| Natural gas \| Basis Swap
Derivative [Line Items]
Gross Amounts of Recognized Assets		993
Net Amounts of Assets Presented in theBalance Sheet		993
Derivative Financial Instruments, Assets \| Crude oil \| Swap
Derivative [Line Items]
Gross Amounts of Recognized Assets	2,360	9,650
Gross Amounts Offset in the Balance Sheet	(591)
Net Amounts of Assets Presented in theBalance Sheet	1,769	9,650
Derivative Financial Instruments, Assets \| Crude oil \| Collars
Derivative [Line Items]
Gross Amounts of Recognized Assets	444	2,222
Gross Amounts Offset in the Balance Sheet	(503)
Net Amounts of Assets Presented in theBalance Sheet	(59)	2,222
Derivative Financial Instruments, Assets \| Swap NGLs (Natural Gasoline) \| C5 swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	5,084	10,674
Gross Amounts Offset in the Balance Sheet	(240)	(31)
Net Amounts of Assets Presented in theBalance Sheet	4,844	$ 10,643
Derivative Financial Instruments, Assets \| Swap NGLs (Natural Gasoline) \| C3 swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	34
Net Amounts of Assets Presented in theBalance Sheet	$ 34

Derivative Activities - Additional Information (Detail) bbl in Millions	3 Months Ended
	Mar. 31, 2013 USD ($) bbl Institution Lenders $ / bbl $ / Mcf	Mar. 31, 2012 USD ($)
Derivative [Line Items]
Derivative assets liabilities at fair value net	$ (593,000)
Unrealized pre-tax derivative gain recorded in AOCI	91,900,000
Gains (Losses) in oil and gas sales related to settled hedging transactions	36,500,000	$ 57,600,000
Ineffective unrealized and realized gains (losses) recognized income	(2,891,000)	$ 237,000
Accumulated other comprehensive income, unrealized net gains	103,600,000
Accumulated other comprehensive income, unrealized net gains, after tax	$ 63,200,000
Number of financial institutions with whom we conduct derivative activities \| Institution	15
Number of secured lenders not in banking credit facility \| Lenders	2
Unrealized net gains during 2013
Derivative [Line Items]
Unrealized net gains, reclassify into earnings	$ 2,300,000
Swap Oil
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| bbl	4.5
Average price of SWAP per MCF \| $ / bbl	94.62
Collars Gas
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| bbl	258.6
Average floor price \| $ / Mcf	4.08
Average cap price \| $ / Mcf	4.64
Collar Oil
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| bbl	1.6
Average floor price \| $ / Mcf	88.23
Average cap price \| $ / Mcf	100.00
2013
Derivative [Line Items]
Unrealized pre-tax derivative gain expected to be reclassified into earnings	$ 80,900,000
2014
Derivative [Line Items]
Unrealized pre-tax derivative gain expected to be reclassified into earnings	$ 10,900,000
Natural gas
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| bbl	77.7
Average price of SWAP per MCF \| $ / Mcf	3.71
Swap NGLs (Natural Gasoline)
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| bbl	1.8
Average price of SWAP per MCF \| $ / bbl	92.72
Nglsc Three Component \| Collars Gas
Derivative [Line Items]
Nonmonetary notional amount of price risk derivatives \| bbl	2.3
Average price of SWAP per MCF \| $ / bbl	37.00

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

Mar. 31, 2013

Dec. 31, 2012

Assets

Commodity swaps and collars

$ 27,439

$ 153,267

Liabilities

Commodity swaps and collars

(28,032)

(7,934)

Bank credit facility

(47,000)

(739,000)

Deferred compensation plan

(222,700)

(187,604)

Subordinated debt

(2,889,505)

(2,139,185)

Carrying Value

Assets

Commodity swaps and collars

27,439

153,267

Marketable securities

^[1]

71,440

57,776

Liabilities

Commodity swaps and collars

(28,032)

(7,934)

Bank credit facility

^[2]

(47,000)

(739,000)

Deferred compensation plan

^[2]

(222,700)

(187,604)

Fair Value

Assets

Commodity swaps and collars

27,439

153,267

Marketable securities

^[1]

71,440

57,776

Liabilities

Commodity swaps and collars

(28,032)

(7,934)

Bank credit facility

^[2]

(47,000)

(739,000)

Deferred compensation plan

^[2]

(222,700)

(187,604)

7.25% Senior Subordinated notes due 2018

Liabilities

Subordinated debt

(250,000)

7.25% Senior Subordinated notes due 2018 | Carrying Value

Liabilities

Subordinated debt

^[2]

(250,000)

7.25% Senior Subordinated notes due 2018 | Fair Value

Liabilities

Subordinated debt

^[2]

(260,000)

(262,500)

8.00% Senior Subordinated notes due 2019

Liabilities

Subordinated debt

(289,505)

(289,185)

8.00% Senior Subordinated notes due 2019 | Carrying Value

Liabilities

Subordinated debt

^[2]

(289,505)

(289,185)

8.00% Senior Subordinated notes due 2019 | Fair Value

Liabilities

Subordinated debt

^[2]

(328,500)

(332,250)

6.75% Senior Subordinated notes due 2020

Liabilities

Subordinated debt

(500,000)

6.75% Senior Subordinated notes due 2020 | Carrying Value

Liabilities

Subordinated debt

^[2]

(500,000)

6.75% Senior Subordinated notes due 2020 | Fair Value

Liabilities

Subordinated debt

^[2]

(550,000)

(542,500)

5.75% Senior Subordinated Notes due 2021 | Carrying Value

Liabilities

Subordinated debt

^[2]

(500,000)

5.75% Senior Subordinated Notes due 2021 | Fair Value

Liabilities

Subordinated debt

^[2]

(536,250)

(535,000)

5.00% Senior Subordinated notes due 2022

Liabilities

Subordinated debt

(600,000)

5.00% Senior Subordinated notes due 2022 | Carrying Value

Liabilities

Subordinated debt

^[2]

(600,000)

5.00% Senior Subordinated notes due 2022 | Fair Value

Liabilities

Subordinated debt

^[2]

(613,500)

$ (627,000)

5.00% senior subordinated notes due 2023 | Carrying Value

Liabilities

Subordinated debt

^[2]

(750,000)

5.00% senior subordinated notes due 2023 | Fair Value

Liabilities

Subordinated debt

^[2]

$ (766,875)

[1]	Marketable securities, which are held in our deferred compensation plans, are actively traded on major exchanges.
[2]	The book value of our bank debt approximates fair value because of its floating rate structure. The fair value of our senior subordinated notes is based on end of period market quotes which are Level 2 market values. Refer to Note 8 for additional information.

Fair Value Measurements - Carrying Amounts and Fair Values of Financial Instruments (Parenthetical) (Detail)	Mar. 31, 2013	Dec. 31, 2012
7.25% Senior Subordinated notes due 2018
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Interest rate on senior subordinated notes	7.25%	7.25%
8.00% Senior Subordinated notes due 2019
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Interest rate on senior subordinated notes	8.00%	8.00%
6.75% Senior Subordinated notes due 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Interest rate on senior subordinated notes	6.75%	6.75%
5.75% Senior Subordinated Notes due 2021
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Interest rate on senior subordinated notes	5.75%	5.75%
5.00% Senior Subordinated notes due 2022
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Interest rate on senior subordinated notes	5.00%	5.00%
5.00% senior subordinated notes due 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Interest rate on senior subordinated notes	5.00%

Fair Value Measurements - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2013 USD ($) Lenders Company	Mar. 31, 2012 USD ($)	Dec. 31, 2012 USD ($)
Fair Value Measurements Of Financial Instruments [Line Items]
Interest and dividends	$ 40,000	$ 62,000
Mark-to-market gain (loss)	1,600,000	$ 4,000,000
Allowance for uncollectible receivables	$ 2,400,000		$ 2,400,000
Number of financial institutions included in counter parties \| Company	15
Number of secured lenders not in banking credit facility \| Lenders	2
Net derivative asset	$ 3,400,000

- Definition

Interest and dividend income on securities that are bought and held principally for the purpose of selling them in the near term ("trading securities") and on securities measured at fair value through earnings.

+ References + Details

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of trading securities held at each balance sheet date, that was included in earnings for the period. Trading securities are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) and the change in net unrealized holding gain (loss) is included in earnings for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(c))
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=16383099&loc=d3e24584-111560

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13
-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 115
-Paragraph 21
-Subparagraph e
-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 115
-Paragraph 12
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Fair Value Measurements - Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value (Detail) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net	$ (593,000)
Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading securities held in the deferred compensation plans	71,440,000	$ 57,776,000
Fair Value, Measurements, Recurring \| Swap
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net	(27,880,000)	23,326,000
Fair Value, Measurements, Recurring \| Collars
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net	27,287,000	121,014,000
Fair Value, Measurements, Recurring \| Basis Swap
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net		993,000
Fair Value, Inputs, Level 1 \| Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading securities held in the deferred compensation plans	71,440,000	57,776,000
Fair Value, Inputs, Level 2 \| Fair Value, Measurements, Recurring \| Swap
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net	(27,880,000)	23,326,000
Fair Value, Inputs, Level 2 \| Fair Value, Measurements, Recurring \| Collars
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net	$ 27,287,000	121,014,000
Fair Value, Inputs, Level 2 \| Fair Value, Measurements, Recurring \| Basis Swap
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets liabilities at fair value net		$ 993,000

Stock-Based Compensation Plans - Stock Option And SARs Activities (Detail)	3 Months Ended
	Mar. 31, 2013 $ / shares shares
Schedule Of Stock Option Activity [Line Items]
Beginning Balance, Shares \| shares	3,433,362
Granted, Shares \| shares	116,413
Exercised, Shares \| shares	(919,085)
Expired/forfeited, Shares \| shares	(36,881)
Ending Balance, Shares \| shares	2,593,809
Beginning Balance, Weighted Average Exercise Price \| $ / shares	$ 52.52
Granted, Weighted Average Exercise Price \| $ / shares	69.23
Exercised, Weighted Average Exercise Price \| $ / shares	52.52
Expired/forfeited, Weighted Average Exercise Price \| $ / shares	52.64
Ending Balance, Weighted Average Exercise Price \| $ / shares	$ 53.24

Stock-Based Compensation Plans - Restricted Stock and Restricted Stock Units Outstanding (Detail)	3 Months Ended
	Mar. 31, 2013 $ / shares shares
Equity Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding, Beginning Balance \| shares	349,156
Granted \| shares	385,688
Vested \| shares	(50,404)
Forfeited \| shares	(3,523)
Outstanding, Ending Balance \| shares	680,917
Outstanding, Beginning Balance \| $ / shares	$ 59.08
Granted \| $ / shares	71.02
Vested \| $ / shares	57.06
Forfeited \| $ / shares	57.99
Outstanding, Ending Balance \| $ / shares	$ 66.00
Liability Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding, Beginning Balance \| shares	423,478
Granted \| shares	125,236
Vested \| shares	(86,161)
Forfeited \| shares	(14,442)
Outstanding, Ending Balance \| shares	448,111
Outstanding, Beginning Balance \| $ / shares	$ 58.91
Granted \| $ / shares	71.40
Vested \| $ / shares	57.11
Forfeited \| $ / shares	56.78
Outstanding, Ending Balance \| $ / shares	$ 62.82

Stock-Based Compensation Plans - Weighted Average Grant Date Fair Value of SARs (Detail) - Stock Appreciation Rights (SARs)	3 Months Ended
	Mar. 31, 2013 $ / shares
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]
Weighted average exercise price per share	$ 69.23
Expected annual dividends per share	0.23%
Expected life in years	3 years 8 months 12 days
Expected volatility	34.00%
Risk-free interest rate	0.60%
Granted	$ 18.41

Stock-Based Compensation Plans - Additional Information (Detail)

3 Months Ended

12 Months Ended

Mar. 31, 2013

USD ($)

Plans

$ / shares

Mar. 31, 2012

USD ($)

$ / shares

Dec. 31, 2012

USD ($)

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Vesting period

3 years

Expiration term of stock options

5 years

Operating expense

$ 30,188,000

$ 29,022,000

Brokered natural gas and marketing expense

22,315,000

4,062,000

Exploration expense

16,780,000

21,516,000

General and administrative

84,058,000

38,729,000

Stock-based compensation expense

^[1]

$ 1,070,000

$ 4,049,000

Active equity-based stock plans | Plans

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

$ (42,400,000)

7,800,000

Shares held in rabbi trust total | shares

2,600,000

2,700,000

Vested shares held in rabbi trust | shares

2,200,000

2,300,000

Equity Awards

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock-based compensation expense

$ 4,300,000

$ 2,100,000

Shares granted to employees | shares

386,000

356,000

Restricted Stock granted average price | $ / shares

$ 71.02

$ 63.37

Vesting period of shares granted to employees

Three-year

Liability Awards

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock-based compensation expense

$ 4,500,000

$ 4,200,000

Vesting period of shares granted to employees

Three-year

Shares granted to employees and directors | shares

125,000

140,000

Restricted stock granted average price | $ / shares

$ 71.40

$ 63.15

Stock Option

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of stock option outstanding | shares

2,593,809

Share Based Compensation Expense

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Operating expense

$ 661,000

$ 357,000

Brokered natural gas and marketing expense

249,000

453,000

Exploration expense

1,100,000

928,000

General and administrative

10,300,000

8,200,000

Stock-based compensation expense

$ 12,300,000

$ 9,900,000

[1]	Includes cost incurred whether capitalized or expensed.

Supplemental Cash Flow Information - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net cash provided from operating activities included:
Income taxes (refunded) paid to taxing authorities	$ (162)	$ 196
Interest paid	37,541	29,636
Non-cash investing and financing activities included:
Asset retirement costs capitalized, net	$ 1,690	$ 1,194

Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2013 USD ($)
Commitments And Contingencies Disclosure [Line Items]
Interest accrues on alleged damages	12.00%
Estimated damage claimed by plaintiff	$ 140.0
Revised Loss Contingency Damages Sought	160.0
Loss contingency accruaed	35.0
Transportation commitments future minimum transportation fees due first quarter change	63.0
Hydraulic fracturing commitment first quarter change	$ 24.0
Number of years transportation commitments future minimum transportation fees due first quarter change	10 years

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349

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

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-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.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 11
-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 5
-Paragraph 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.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9
-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 - Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (Detail) - USD ($)
$ in Thousands

Mar. 31, 2013

Dec. 31, 2012

Natural gas and oil properties:

Properties subject to depletion

^[1]

$ 7,396,037

$ 7,368,308

Unproved properties

^[1]

732,163

743,467

Total

^[1]

8,128,200

8,111,775

Accumulated depreciation, depletion and amortization

^[1]

(1,944,252)

(2,015,591)

Net capitalized costs

^[1]

$ 6,183,948

$ 6,096,184

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

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

3 Months Ended

12 Months Ended

Mar. 31, 2013

Dec. 31, 2012

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

Acreage purchases

^[1]

$ 9,394

$ 188,843

Development

^[1]

309,240