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Document and Entity Information - USD ($)	6 Months Ended
Document and Entity Information - USD ($)	Jun. 30, 2011	Jul. 22, 2011	Jun. 30, 2010
Document and Entity Information [Abstract]
Entity Registrant Name	RANGE RESOURCES CORP
Entity Central Index Key	0000315852
Document Type	10-Q
Document Period End Date	Jun. 30, 2011
Amendment Flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2
Company Fiscal Year End Date	--12-31
Entity Well Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 6,999,629,000
Entity Common Stock Shares Outstanding		161,058,704

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 288,839	$ 2,848
Accounts receivable, less allowance for doubtful accounts of $3,842 and $5,001	66,772	76,683
Unrealized derivative gain	53,674	123,255
Assets of discontinued operations	16,351	876,304
Inventory and other	11,912	21,352
Deferred tax asset	6,340	0
Total current assets	443,888	1,100,442
Unrealized derivative gain	11,843	0
Equity method investments	139,935	155,105
Natural gas and oil properties, successful efforts method	5,999,665	5,390,391
Accumulated depletion and depreciation	(1,447,300)	(1,306,378)
Natural gas and oil properties, successful efforts method, net	4,552,365	4,084,013
Transportation and field assets	121,905	134,980
Accumulated depreciation and amortization	(64,459)	(60,931)
Transportation and field assets, net	57,446	74,049
Other assets	104,430	84,977
Total assets	5,309,907	5,498,586
Current liabilities:
Accounts payable	246,549	289,109
Asset retirement obligations	4,020	4,020
Accrued liabilities	53,077	60,082
Deferred tax liability	0	11,848
Accrued interest	29,013	32,189
Unrealized derivative loss	0	352
Current liabilities of discontinued operations	19,381	32,962
Total current liabilities	352,040	430,562
Bank debt	0	274,000
Subordinated notes	1,787,398	1,686,536
Deferred tax liability	685,200	672,041
Unrealized derivative loss	4,427	13,412
Deferred compensation liability	159,024	134,488
Asset retirement obligations and other liabilities	76,891	59,885
Long-term liabilities of discontinued operations	0	3,901
Commitments and contingencies
Stockholders' Equity
Preferred stock, $1 par, 10,000,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.01 par, 475,000,000 shares authorized, 160,998,360 issued at June 30, 2011 and 160,113,608 issued at December 31, 2010	1,610	1,601
Common stock held in treasury, 175,653 shares at June 30, 2011 and 204,556 shares at December 31, 2010	(6,489)	(7,512)
Additional paid-in capital	1,848,767	1,820,503
Retained earnings	355,099	341,699
Accumulated other comprehensive income	45,940	67,470
Total stockholders' equity	2,244,927	2,223,761
Total liabilities and stockholders' equity	$ 5,309,907	$ 5,498,586

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Allowance for doubtful accounts on accounts receivable	$ 3,842	$ 5,001
Stockholders' Equity
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	475,000,000	475,000,000
Common stock, shares issued	160,998,360	160,113,608
Common stock held in treasury, shares	175,653	204,556

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues and other income
Natural gas, NGL and oil sales	$ 256,687	$ 173,153	$ 483,568	$ 360,826
Transportation and gathering	(1,041)	663	(728)	2,744
Derivative fair value income	53,039	6,546	12,205	48,879
(Loss) gain on the sale of assets	(1,621)	10,176	(1,482)	78,089
Other	(435)	637	642	(938)
Total revenues and other income	306,629	191,175	494,205	489,600
Costs and expenses
Direct operating	28,509	21,171	57,226	43,007
Production and ad valorem taxes	7,550	5,663	14,429	12,205
Exploration	11,592	14,420	38,779	28,559
Abandonment and impairment of unproved properties	18,900	9,727	35,437	16,278
General and administrative	39,120	35,836	73,079	64,006
Termination costs				7,938
Deferred compensation plan	(5,778)	(14,135)	24,852	(19,847)
Interest expense	31,383	21,271	56,162	42,202
Loss on early extinguishment of debt	18,580		18,580
Depletion, depreciation and amortization	78,294	67,813	150,510	132,620
Impairment of proved properties				6,505
Total costs and expenses	228,150	161,766	469,054	333,473
Income from continuing operations before income taxes	78,479	29,409	25,151	156,127
Income tax expense
Current	8		8
Deferred	32,695	11,763	12,798	60,775
Total income tax expense	32,703	11,763	12,806	60,775
Income from continuing operations	45,776	17,646	12,345	95,352
Discontinued operations, net of taxes	5,517	(8,594)	13,915	(8,721)
Net income	$ 51,293	$ 9,052	$ 26,260	$ 86,631
Income per common share
Basic-income from continuing operations	$ 0.28	$ 0.11	$ 0.08	$ 0.59
- discontinued operations	0.04	(0.05)	0.08	(0.05)
- net income	0.32	0.06	0.16	0.54
Diluted-income from continuing operations	0.28	0.11	0.08	0.59
- discontinued operations	0.04	(0.05)	0.08	(0.05)
- net income	0.32	0.06	0.16	0.54
Dividends per common share	$ 0.04	$ 0.04	$ 0.08	$ 0.08
Weighted average common shares outstanding
Basic	157,997	156,820	157,772	156,608
Diluted	158,833	158,472	158,729	158,601

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating activities
Net income	$ 26,260	$ 86,631
Adjustments to reconcile net cash provided from operating activities:
(Gain) loss from discontinued operations	(13,915)	8,721
Loss from equity method investments, net of distributions	19,259	985
Deferred income tax expense	12,798	60,775
Depletion, depreciation, amortization and proved property impairment	150,510	139,126
Exploration dry hole costs	6
Mark-to-market gain on gas and oil derivatives not designated as hedges	(8,103)	(42,169)
Abandonment and impairment of unproved properties	35,437	16,278
Unrealized derivative gain	(6,502)	(11)
Allowance for bad debts	(404)
Deferred and stock-based compensation	48,161	5,866
Amortization of deferred financing costs, loss on extinguishment of debt and other	19,891	2,367
Loss (gain) on sale of assets	1,483	(78,089)
Changes in working capital:
Accounts receivable	(4,159)	8,061
Inventory and other	2,747	338
Accounts payable	(6,222)	13,859
Accrued liabilities and other	(436)	(14,038)
Net cash provided from continuing operations	276,811	208,700
Net cash provided from discontinued operations	36,802	51,737
Net cash provided from operating activities	313,613	260,437
Investing activities
Additions to oil and gas properties	(535,307)	(322,395)
Additions to field service assets	(2,830)	(10,270)
Acreage and proved property purchases	(73,070)	(187,192)
Other assets		(45)
Proceeds from disposal of assets	23,409	318,632
Purchase of marketable securities held by the deferred compensation plan	(8,832)	(14,553)
Proceeds from the sales of marketable securities held by the deferred compensation plan	6,620	13,296
Net cash used in investing activities from continuing operations	(590,010)	(202,527)
Investing activities of discontinued operations	835,147	(27,011)
Net cash provided from (used in) investing activities	245,137	(229,538)
Financing activities
Borrowing on credit facilities	490,826	371,000
Repayment on credit facilities	(764,826)	(220,000)
Dividends paid	(12,860)	(12,768)
Issuance of common stock	554	5,785
Issuance of subordinated notes	500,000
Repayment of subordinated notes	(413,332)
Debt issuance costs	(21,653)
Change in cash overdrafts	(58,265)	(13,385)
Proceeds from the sales of common stock held by the deferred compensation plan	6,797	4,560
Net cash (used in) provided from financing activities	(272,759)	135,192
Increase in cash and equivalents	285,991	166,091
Cash and cash equivalents at beginning of period	2,848	767
Cash and cash equivalents at end of period	$ 288,839	$ 166,858

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income	$ 51,293	$ 9,052	$ 26,260	$ 86,631
Other comprehensive (loss) income:
Realized gain on hedge derivative contract settlements reclassified into earnings from other comprehensive income, net of taxes	(15,178)	(11,371)	(39,068)	(12,124)
Change in unrealized deferred hedging gains (losses), net of taxes	17,424	(4,257)	17,537	48,325
Total comprehensive income (loss)	$ 53,539	$ (6,576)	$ 4,729	$ 122,832

- 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

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+ Details

- Definition

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

+ References

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+ Details

- Definition

Net of tax effect change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges after taxes. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

+ References

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+ Details

- Definition

Change in accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges, net of tax effect. The after tax effect change includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

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+ Details

Organization and Nature of Business	6 Months Ended
Organization and Nature of Business	Jun. 30, 2011
Organization and Nature of Business [Abstract]
ORGANIZATION AND NATURE OF BUSINESS	(1) ORGANIZATION AND NATURE OF BUSINESS We are a Fort Worth, Texas-based independent natural gas and oil company engaged in the exploration, development and acquisition of natural gas and oil properties, mostly in the Appalachia and the Southwest 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 Resources Corporation is a Delaware corporation with our common stock listed and traded on the New York Stock Exchange under the symbol “RRC.”

Basis of Presentation	6 Months Ended
Basis of Presentation	Jun. 30, 2011
Basis of Presentation [Abstract]
BASIS OF PRESENTATION	(2) BASIS OF PRESENTATION Presentation These interim financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Range Resources Corporation 2010 Annual Report on Form 10-K filed on March 1, 2011 and our current report on Form 8-K filed on May 6, 2011. The results of operations for the quarter and the six months ended June 30, 2011 are not necessarily indicative of the results to be expected for the full year. These consolidated financial statements are unaudited but, in the opinion of management, reflect all adjustments necessary for fair presentation of the results for the periods presented. All adjustments are of a normal recurring nature unless disclosed otherwise. These consolidated financial statements, including selected notes, have been prepared in accordance with the applicable rules of the Securities and Exchange Commission (“SEC”) and do not include all of the information and disclosures required by accounting principles generally accepted in the United States of America (“U.S. GAAP”) for complete financial statements. Discontinued Operations In February 2011, we entered into an agreement to sell substantially all of our Barnett Shale assets. In April 2011, we completed the sale of most of these assets. We expect to close on the remainder of the sale in the third quarter 2011. We have classified the assets and liabilities of these assets as discontinued operations in the accompanying consolidated balance sheets along with the historic results of these operations as discontinued operations, net of tax, in the accompanying consolidated statements of operations. See also Note 4 and 5 for more information regarding the sale of our Barnett Shale assets.

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 2-6
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Name Statement of Position (SOP)
-Publisher AICPA
-Number 94-6
-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 3: http://www.xbrl.org/2003/role/presentationRef
-Name FASB Interpretation (FIN)
-Publisher FASB
-Number 46R
-Paragraph 4, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6359553&loc=d3e288-107754

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2197480

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6921930&loc=d3e5614-111684

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 915
-SubTopic 235
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6472506&loc=d3e38932-110933

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2209116

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/subtopic&trid=2122524

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2134480

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS140-4/FIN46(R)-8
-Paragraph 8, C1, C7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

New Accounting Standards	6 Months Ended
New Accounting Standards	Jun. 30, 2011
New Accounting Standards [Abstract]
NEW ACCOUNTING STANDARDS	(3) NEW ACCOUNTING STANDARDS In May 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2011-04, “Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and International Financial Reporting Standards (“IFRS”).” This pronouncement was issued to provide a consistent definition of fair value and ensure that the fair value measurement and disclosure requirements are similar between U.S. GAAP and IFRS. ASU 2011-04 changes certain fair value measurement principles and enhances the disclosure requirements, particularly for Level 3 fair value measurements. This pronouncement is effective for reporting periods beginning on or after December 15, 2011, with early adoption prohibited. The new guidance will require prospective application. We are currently evaluating the effect that the provisions of this pronouncement will have on our financial statements. In June 2011, the FASB issued ASU No. 2011-05, “Presentation of Comprehensive Income” which was issued to enhance comparability between entities that report under U.S. GAAP and IFRS, and to provide a more consistent method of presenting non-owner transactions that affect an entity’s equity. ASU 2011-05 eliminates the option to report other comprehensive income and its components in the statement of changes in stockholders’ equity and requires an entity to present the total of comprehensive income, the components of net income and the components of other comprehensive income either in a single continuous statement or in two separate but consecutive statements. This pronouncement is effective for fiscal years, and interim periods within those years, beginning after December 15, 2011. Early adoption of the new guidance is permitted and full retrospective application is required. We are currently evaluating the effect that the provisions of this pronouncement will have on our financial statements.

Dispositions	6 Months Ended
Dispositions	Jun. 30, 2011
Dispositions [Abstract]
DISPOSITIONS	(4) DISPOSITIONS 2011 Asset Sales In February 2011, we entered into an agreement to sell substantially all of our Barnett Shale natural gas properties in the Barnett Shale Play located in North Central Texas (Dallas, Denton, Ellis, Hill, Hood, Johnson, Parker, Tarrant and Wise Counties), which also included the assumption of certain derivative contracts by the buyer and is subject to normal post closing adjustments. We closed substantially all of this sale in second quarter 2011, for gross cash proceeds of approximately $877.0 million, including the derivative contracts assumed. This transaction is subject to additional closings on certain properties subject to preferential rights along with other post-closing adjustments. We expect to close the remainder of the sale in the third quarter 2011. The agreements have an effective date of February 1, 2011 and consequently operating net revenues after February 1, 2011 were a downward adjustment to the selling price. We recorded a pretax gain of $3.8 million in discontinued operations related to this sale. In the accompanying December 31, 2010 balance sheet, we have classified these assets and liabilities as discontinued operations. As indicated in Note 2 and 5, the historic results of our Barnett operations are presented as discontinued operations. As part of the sale of our Barnett properties, certain derivative contracts were assumed by the buyer. This resulted in a loss of $1.7 million in second quarter 2011. Under cash flow hedge accounting, an $18.8 million pretax gain related to these hedges is included in accumulated other comprehensive income at June 30, 2011 and will be recognized in earnings during the remainder of 2011 as the hedged production occurs. The hedges assumed as part of the sale were not designated to our Barnett production and were sold to balance our volumes hedged. 2010 Asset Sales In February 2010, we entered into an agreement to sell our tight gas sand properties in Ohio. We closed approximately 90% of the sale in March 2010 and closed the remainder in June 2010. Proceeds received in first six months 2010 were approximately $323.0 million and we recorded a gain of $77.4 million in continuing operations. The agreement had an effective date of January 1, 2010, and consequently operating net revenues after January 1, 2010 were a downward adjustment to the selling price. The proceeds we received were placed in a like-kind exchange account and in June 2010, we used a portion of the proceeds to purchase proved and unproved natural gas properties in Virginia. In September 2010, the like-kind exchange account was closed and the balance of these proceeds ($135.0 million) was used to repay amounts outstanding under our bank credit facility.

Discontinued Operations

6 Months Ended

Jun. 30, 2011

Discontinued Operations [Abstract]

DISCONTINUED OPERATIONS

(5) DISCONTINUED OPERATIONS

The following table presents the components of our Barnett operations as discontinued operations for the three months and the six months ended June 30, 2011 and 2010 (in thousands):


	Three Months Ended June 30,					Six Months Ended June 30,
	2011		2010			2011		2010
Revenues and other income
Natural gas, NGL and oil sales	$	10,777	$	33,631		$	53,034	$	82,718
Transportation and gathering		1		11			6		23
Gain on the sale of assets		3,820		—			3,820		955
Other		—		—			4		—

Total revenues and other income		14,598		33,642			56,864		83,696


Costs and expenses
Direct operating		2,169		8,604			10,446		17,808
Production and ad valorem taxes		184		2,427			1,250		3,955
Exploration		5		53			37		549
Abandonment and impairment of unproved properties		—		3,770			—		9,626
Interest expense		3,715		9,508			14,791		18,864
Depletion, depreciation and amortization		14		23,184			8,894		47,003

Total costs and expenses		6,087		47,546			35,418		97,805


Income (loss) from discontinued operations before income taxes		8,511		(13,904	)		21,446		(14,109	)

Income tax expense (benefit)
Current		—		—			—		—
Deferred		2,994		(5,310	)		7,531		(5,388	)

Total income tax expense (benefit)		2,994		(5,310	)		7,531		(5,388	)


Net income (loss) from discontinued operations	$	5,517	$	(8,594	)	$	13,915	$	(8,721	)

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


	June 30,		December 31,
	2011		2010
Composition of assets of discontinued operations:
Natural gas and oil properties, net	$	12,546	$	838,044
Transportation and field assets, net		—		684
Accounts receivable		3,805		29,300
Unrealized derivative gain		—		8,195
Inventory and other		—		81

Total assets of discontinued operations	$	16,351	$	876,304


Composition of liabilities of discontinued operations:
Account payable	$	12,592	$	23,366
Accrued liabilities		6,789		9,596

Total current liabilities of discontinued operations	$	19,381	$	32,962


Asset retirement obligations	$	—	$	1,980
Other liabilities		—		1,921

Total long-term liabilities of discontinued operations	$	—	$	3,901

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 43-48
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

Reference 4: 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=6360339&loc=d3e1510-107760

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

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1012-107759

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1474-107760

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6390789&loc=d3e2443-110228

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760

+ Details

Income Taxes

6 Months Ended

Jun. 30, 2011

Income Taxes [Abstract]

INCOME TAXES

(6) INCOME TAXES

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


	Three Months Ended						Six Month Ended
	June 30,						June 30,
	2011			2010			2011			2010

Income tax expense	$	32,703		$	11,763		$	12,806		$	60,775
Effective tax rate		41.7	%		40.0	%		50.9	%		38.9	%

We compute our quarterly taxes under the effective tax rate method based on applying an anticipated annual effective rate to our year-to-date income, except for discrete items. Income taxes for discrete items are computed and recorded in the period that the specific transaction occurs. For the three months ended June 30, 2011 and 2010, our overall effective tax rate on pre-tax income from continuing operations was different than the statutory rate of 35% due primarily to state income taxes, valuation allowances and other permanent differences. For the six months ended June 30, 2011 and 2010, our overall effective rate on pre-tax income from continuing operations was different than the statutory rate of 35% due primarily to state income taxes, valuation allowances and other permanent differences.

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

Income From Continuing Operations Per Common Share

6 Months Ended

Jun. 30, 2011

Income from Continuing Operations Per Common Share [Abstract]

INCOME FROM CONTINUING OPERATIONS PER COMMON SHARE

(7) INCOME FROM CONTINUING OPERATIONS PER COMMON SHARE

Basic income or loss from continuing operations per share is computed as (i) income or loss from continuing operations (ii) less income allocable to participating securities (iii) divided by weighted average basic shares outstanding. Diluted income or loss from continuing operations per share is computed as (i) basic income or loss from continuing operations attributable to common shareholders (ii) plus diluted adjustments to income allocable to participating securities (iii) divided by weighted average diluted shares outstanding. The following table sets forth a reconciliation of income from continuing operations to basic income from continuing operations attributable to common shareholders and to diluted income from continuing operations attributable to common shareholders and a reconciliation of basic weighted average common shares outstanding to diluted weighted average common shares outstanding (in thousands except per share amounts):


	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2011			2010			2011			2010
Numerator:
Income from continuing operations	$	45,776		$	17,646		$	12,345		$	95,352
Less: Basic income allocable to participating securities ^(a)		(808	)		(159	)		(220	)		(1,491	)

Basic income from continuing operations attributable to common shareholders		44,968			17,487			12,125			93,861
Diluted adjustments to income allocable to participating securities ^(a)		4			—			1			16

Diluted income from continuing operations attributable to common shareholders	$	44,972		$	17,487		$	12,126		$	93,877


Denominator:
Weighted average common shares outstanding — basic		157,997			156,820			157,772			156,608
Effect of dilutive securities:
Employee stock options and SARs		836			1,652			957			1,993

Weighted average common shares — diluted		158,833			158,472			158,729			158,601


Income from continuing operations per common share:
Basic — net income	$	0.28		$	0.11		$	0.08		$	0.59
Diluted — net income	$	0.28		$	0.11		$	0.08		$	0.59


^(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. Restricted stock awards do not participate in undistributed net losses.

The weighted average common shares — basic for the three months ended June 30, 2011 and 2010 exclude 2.8 million shares of restricted stock which is held in our deferred compensation plans (although all restricted stock is issued and outstanding upon grant). Weighted average common shares-basic for the six months ended June 30, 2011 excludes 2.9 million shares of restricted stock compared to 2.7 million for the six months ended June 30, 2010. SARs of 860,000 for the three months ended June 30, 2011 and 1.0 million for the six months ended June 30, 2011 were outstanding but not included in the computations of diluted income from continuing operations per share because the grant prices of the SARs were greater than the average market price of the common shares. SARs of 1.1 million for the three months ended June 30, 2010 and 1.1 million for the six months ended June 30, 2010 were outstanding but not included in the computations of diluted income from continuing operations per share because the grant prices of the SARs were greater than the average market price of the common shares.

Suspended Exploratory Well Costs

6 Months Ended

Jun. 30, 2011

Extractive Industries [Abstract]

SUSPENDED EXPLORATORY WELL COSTS

(8) SUSPENDED EXPLORATORY WELL COSTS

The following table reflects the changes in capitalized exploratory well costs for the six months ended June 30, 2011 and the year ended December 31, 2010 (in thousands):


	June 30,			December 31,
	2011			2010
Beginning balance at January 1	$	23,908		$	19,052
Additions to capitalized exploratory well costs pending the determination of proved reserves		35,463			28,897
Reclassifications based on determination of proved reserves		(11,619	)		(24,041	)
Capitalized exploratory well costs charged to expense		—			—

Balance at end of period		47,752			23,908
Less exploratory well costs that have been capitalized for a period of one year or less		(42,519	)		(13,181	)

Capitalized exploratory well costs that have been capitalized for a period greater than one year	$	5,233		$	10,727

Number of projects that have exploratory well costs that have been capitalized for a period greater than one year		3			4

As of June 30, 2011, of the $5.2 million of capitalized exploratory well costs that have been capitalized for more than one year, two of the wells are Marcellus Shale wells and are waiting on the completion of pipelines. The following provides an aging of capitalized exploratory well costs that have been suspended for more than one year as of June 30, 2011 (in thousands):


	Total		2011		2010		2009		2008

Capitalized exploratory well costs that have been capitalized for more than one year	$	5,233	$	255	$	334	$	3,065	$	1,579

Indebtedness

6 Months Ended

Jun. 30, 2011

Indebtedness [Abstract]

INDEBTEDNESS

(9) INDEBTEDNESS

We had the following debt outstanding as of the dates shown below (in thousands). No interest expense was capitalized during the three months and the six months ended June 30, 2011 and 2010.


	June 30,		December 31,
	2011		2010
Bank debt	$	—	$	274,000

Subordinated debt:
6.375% Senior Subordinated Notes due 2015		—		150,000
7.5% Senior Subordinated Notes due 2016, net of discount		—		249,683
7.5% Senior Subordinated Notes due 2017		250,000		250,000
7.25% Senior Subordinated Notes due 2018		250,000		250,000
8.0% Senior Subordinated Notes due 2019, net of discount		287,398		286,853
6.75% Senior Subordinated Notes due 2020		500,000		500,000
5.75% Senior Subordinated Notes due 2021		500,000		—

Total debt	$	1,787,398	$	1,960,536

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. Our new borrowing base was set without our Barnett Shale assets. The bank credit facility provides for an initial commitment equal to the lesser of the facility amount or the borrowing base. On June 30, 2011, the borrowing base was $2.0 billion and our facility amount was $1.5 billion. The bank credit facility provides for a borrowing base subject to redeterminations semi-annually and for event-driven unscheduled redeterminations. Our current bank group is comprised of twenty-seven commercial banks with no one bank holding more than 7% of the total facility. The facility amount may be increased up to the borrowing base amount with twenty days notice, subject to payment of a mutually acceptable commitment fee to those banks agreeing to participate in the facility amount increase. At June 30, 2011, we had no outstanding balances under our bank credit facility and we had $13.9 million of undrawn letters of credit leaving approximately $1.5 billion of borrowing capacity available under the facility amount. The facility matures in February 2016. Borrowing under the bank credit facility can either be the Alternate Base Rate (as defined) plus a spread ranging from 0.50% to 1.50% or LIBOR borrowings at the Adjusted LIBO Rate (as defined) plus a spread ranging from 1.50% to 2.50%. 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 part of the base rate loans to LIBOR loans. The weighted average interest rate on the bank credit facility was 2.0% for the three months ended June 30, 2011 compared to 2.2% for the three months ended June 30, 2010. The weighted average interest rate on the bank credit facility was 2.2% for the six months ended June 30, 2011 compared to 2.2% for the six months ended June 30, 2010. A commitment fee is paid on the undrawn balance based on an annual rate of between 0.375% and 0.50%. At June 30, 2011, the commitment fee was 0.375%.

Senior Subordinated Notes

In May 2011, we issued $500.0 million aggregate principal amount of 5.75% senior subordinated notes due 2021 (“5.75% Notes”) for net proceeds after underwriting discounts and commissions of $491.3 million. The 5.75% Notes were issued at par. Interest on the 5.75% Notes is payable semi-annually in June and December and is guaranteed by all of our current subsidiaries. We may redeem the 5.75% Notes, in whole or in part, at any time on or after June 1, 2016, at redemption prices of 102.875% of the principal amount as of June 1, 2016 declining to 100.0% on June 1, 2019 and thereafter. Before June 2014, we may redeem up to 35% of the original aggregate principal amount of the 5.75% Notes at a redemption price equal to 105.75% 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 5.75% Notes remain 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, we used $112.9 million of the proceeds to purchase our 6.375% senior subordinated notes due 2015 and $207.1 million of the proceeds to purchase our 7.5% senior subordinated notes due 2016 as part of the tender offer and redemption described below.

On May 11, 2011, we commenced cash tender offers to purchase the entire outstanding $150.0 million principal amount of our 6.375% senior subordinated notes due 2015 and $250.0 million principal amount of our 7.5% senior subordinated notes due 2016. On May 25, 2011, after the expiration of the tender offers, we accepted for purchase $108.9 million in principal of the 2015 notes at 102.375% of par and $198.8 million in principal of the 2016 notes for 104.00% of par. We subsequently called the remaining 2015 and 2016 notes, redeeming all of the remaining outstanding 2015 notes ($41.1 million) at 102.125% of par on June 24, 2011 and redeeming all of the remaining outstanding 2016 notes ($51.2 million) at 103.75% of par on June 24, 2011. During the second quarter 2011, we recognized an $18.6 million loss on extinguishment of debt, including transaction call premium cost as well as expensing of deferred financing cost on repurchased debt.

Debt Covenants

Our bank credit facility contains negative covenants that limit our ability, among other things, to pay cash dividends, incur additional indebtedness, sell assets, enter into certain hedging contracts, change the nature of our business or operations, merge, consolidate, or make investments. In addition, we are required to maintain a ratio of debt to EBITDAX (as defined in the credit agreement) of no greater than 4.25 to 1.0 and a current ratio (as defined in the credit agreement) of no less than 1.0 to 1.0. We were in compliance with our covenants under the bank credit facility at June 30, 2011.

The indentures governing our senior subordinated notes contain various restrictive covenants that are substantially identical to each other and may limit our ability to, among other things, pay cash dividends, incur additional indebtedness, sell assets, enter into transactions with affiliates or change the nature of our business. At June 30, 2011, we were in compliance with these covenants.

- Definition

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

+ References + Details

Asset Retirement Obligations

6 Months Ended

Jun. 30, 2011

Asset Retirement Obligation [Abstract]

ASSET RETIREMENT OBLIGATIONS

(10) ASSET RETIREMENT OBLIGATIONS

Our asset retirement obligations primarily represent the estimated present value of the amount 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. A reconciliation of our liability for plugging, abandonment and remediation costs for the six months ended June 30, 2011 is as follows (in thousands):


	Six Months
	Ended
	June 30,
	2011
Beginning of period — continuing operations	$	60,693
Liabilities incurred		1,447
Liabilities settled		(1,625	)
Accretion expense — continuing operations		2,580
Change in estimate		11,270

End of period — continuing operations	$	74,365

Accretion expense is recognized as a component of depreciation, depletion and amortization expense on our consolidated statements of operations.

Capital Stock

6 Months Ended

Jun. 30, 2011

Capital Stock [Abstract]

CAPITAL STOCK

(11) CAPITAL STOCK

We have authorized capital stock of 485 million shares, which includes 475 million shares of common stock and 10 million shares of preferred stock. The following is a summary of changes in the number of common shares outstanding since the beginning of 2010:


	Six Months		Year
	Ended		Ended
	June 30,		December 31,
	2011		2010
Beginning balance		159,909,052		158,118,937
Stock options/SARs exercised		558,161		991,988
Restricted stock grants		326,591		405,127
Treasury shares issued		28,903		12,771
Shares issued for acreage purchases		—		380,229

Ending balance		160,822,707		159,909,052

Treasury Stock

The Board of Directors has approved up to $10.0 million of repurchases of common stock based on market conditions and opportunities and on June 30, 2011, we have $6.8 million remaining under this authorization.

- 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 AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph d

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 7, 11A
-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 129
-Paragraph 2, 3, 4, 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

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

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 11: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.3-04)
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 17: http://www.xbrl.org/2003/role/presentationRef
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Reference 18: http://www.xbrl.org/2003/role/presentationRef
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Reference 20: http://www.xbrl.org/2003/role/presentationRef
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Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Derivative Activities

6 Months Ended

Jun. 30, 2011

Derivative Activities [Abstract]

DERIVATIVE ACTIVITIES

(12) DERIVATIVE ACTIVITIES

We use commodity—based derivative contracts to manage exposure to commodity price fluctuations. We do not enter into these arrangements for speculative or trading purposes. We do not utilize complex derivatives such as swaptions, knockouts or extendable swaps. We typically utilize commodity swap, collar or call option contracts to (1) reduce the effect of price volatility of the commodities we produce and sell and (2) support our annual capital budget and expenditure plans. Historically, our derivative activities have consisted of collars and fixed price swaps. At June 30, 2011, we had open swap contracts covering 25.6 Bcf of natural gas at prices averaging $5.00 per mcf and 3.1 million barrels of NGLs (the C5 component of NGLs) at prices averaging $103.24 per barrel. At June 30, 2011, we had collars covering 189.1 Bcf of natural gas at weighted average floor and cap prices of $5.27 to $5.93 per mcf and 0.7 million barrels of oil at weighted average floor and cap prices of $70.00 to $80.00 per barrel. At June 30, 2011, we also had sold call options for 2.7 million barrels of oil at a weighted average price of $83.15. In first quarter 2011, we entered into NGL derivative swap contracts for the natural gasoline (or C5) component of natural gas liquids. The fair value of our commodity derivatives, represented by the estimated amount that would be realized upon termination, based on a comparison of the contract prices and a reference price, generally New York Mercantile Exchange (“NYMEX”), on June 30, 2011, was a net unrealized pre-tax gain of $61.1 million. These contracts expire monthly through December 2013.

The following table sets forth our derivative volumes and average hedge prices as of June 30, 2011:


			Average
Period	Contract Type	Volume Hedged	Hedge Price
Natural Gas
2012	Swaps	70,192 Mmbtu/day	$	5.00
2011	Collars	333,200 Mmbtu/day	$	5.38-$6.23
2012	Collars	189,641 Mmbtu/day	$	5.32-$5.91
2013	Collars	160,000 Mmbtu/day	$	5.09-$5.65

Crude Oil
2012	Collars	2,000 bbls/day	$	70.00-$80.00
2011	Call options	5,500 bbls/day	$	80.00
2012	Call options	4,700 bbls/day	$	85.00

NGLs (Natural gasoline)
2011	Swaps	7,000 bbls/day	$	104.17
2012	Swaps	5,000 bbls/day	$	102.59

Every derivative instrument is recorded on the accompanying balance sheets as either an asset or a liability measured at its fair value. Fair value is generally 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 derivatives that qualify for hedge accounting are recorded as a component of accumulated other comprehensive income (“AOCI”) in the stockholders’ equity section of the accompanying consolidated balance sheets, which is later transferred to natural gas, NGL and oil sales when the underlying physical transaction occurs and the hedging contract is settled. Amounts included in AOCI at June 30, 2011 and December 31, 2010 relate solely to our commodity derivative activities. As of June 30, 2011, an unrealized pre-tax derivative gain of $73.5 million was recorded in AOCI. This gain is expected to be reclassified into earnings as a $44.1 million gain in 2011, a $21.9 million gain in 2012 and a $7.5 million gain in 2013. The actual reclassification to earnings will be based on market prices at the contract settlement date.

For those derivative instruments that qualify for hedge accounting, settled transaction gains and losses are determined monthly, and are included as increases or decreases to natural gas, NGL and oil sales in the period the hedged production is sold. Natural gas, NGL and oil sales include $24.3 million of gains in the three months ended June 30, 2011 compared to gains of $18.3 million in the same period of 2010 related to settled hedging transactions. Natural gas, NGL and oil sales include $53.9 million of gains in the six months ended June 30, 2011 compared to gains of $19.6 million in the same period of 2010 related to settled hedges. Any ineffectiveness associated with these hedge derivatives is included in derivative fair value income in the accompanying consolidated statements of operations. The ineffective portion is calculated as the difference between the change in fair value of the derivative and the estimated change in future cash flows from the item hedged. The three months ended June 30, 2011 includes ineffective gains (unrealized and realized) of $7.5 million compared to gains of $265,000 in the same period of 2010. The six months ended June 30, 2011 includes ineffective gains (unrealized and realized) of $9.0 million compared to losses of $341,000 in the same period of 2010.

Through June 30, 2011, we have elected to designate our commodity derivative instruments that qualify for hedge accounting as cash flow hedges. To designate a derivative as a cash flow hedge, we document at the hedge’s inception our assessment that the derivative will be highly effective in offsetting expected changes in cash flows from the item hedged. This assessment, which is updated at least quarterly, is generally based on the most recent relevant historical correlation between the derivative and the item hedged. The ineffective portion of the hedge is calculated as the difference between the change in fair value of the derivative and the estimated change in cash flows from the item hedged. If, during the derivative’s term, we determine the hedge is no longer highly effective, hedge accounting is prospectively discontinued and any remaining unrealized gains or losses, based on the effective portion of the derivative at that date, are reclassified to earnings as natural gas, NGL and oil sales when the underlying transaction occurs. If it is determined that the designated hedge transaction is not probable to occur, any unrealized gains or losses are recognized immediately in derivative fair value income (loss) in the accompanying consolidated statements of operations. During the first three and six months of 2011 or 2010, there were no gains or losses recorded due to the discontinuance of hedge accounting treatment for these derivatives.

Some of our derivatives do not qualify for hedge accounting or are not designated as a hedge but provide an economic hedge of our exposure to commodity price risk associated with anticipated future natural gas and oil production. These contracts are accounted for using the mark-to-market accounting method. We recognize all unrealized and realized gains and losses related to these contracts in derivative fair value income in the accompanying consolidated statements of operations (for additional information see table below).

Derivative Fair Value Income

The following table presents information about the components of derivative fair value income in the three and six months ended June 30, 2011 and 2010 (in thousands):


	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2011			2010			2011			2010
Hedge ineffectiveness — realized	$	1,576		$	5		$	2,522		$	(352	)
— unrealized		5,934			260			6,502			11
Change in fair value of derivatives that do not qualify for hedge accounting^(a)		48,139			(4,409	)		8,103			42,169
Realized gain on settlements — gas^{(a) (b)}		3,484			10,690			3,090			7,051
Realized loss on settlements — oil^{(a) (b)}		(6,094	)		—			(8,012	)		—

Derivative fair value income	$	53,039		$	6,546		$	12,205		$	48,879


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

^(b)		These amounts represent the realized gains or losses on settled derivatives that do not qualify for hedge accounting, which before settlement are included in the category described above called change in fair value of derivatives that do not qualify for hedge accounting.

The combined fair value of derivatives included in the accompanying consolidated balance sheets as of June 30, 2011 and December 31, 2010 is summarized below (in thousands). As of June 30, 2011 we have conducted commodity derivative activities with ten financial institutions, of which all but one 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. In our accompanying consolidated balance sheets, derivative assets and liabilities are netted where derivatives with both gain and loss positions are held by a single counterparty.


	June 30,			December 31,
	2011			2010
Derivative assets:
Natural gas — collars	$	107,258		$	155,159
— collars — discontinued operations		—			8,195
— swaps		4,014			—
Crude oil — collars		(15,830	)		—
— call options		(43,675	)		(31,904	)
NGL — swaps		13,750			—

	$	65,517		$	131,450


Derivative liabilities:
Natural gas — collars	$	3,079		$	27,032
— basis swaps		—			(352	)
— swaps		169			—
Crude oil — collars		—			(12,051	)
— call options		(7,675	)		(28,393	)
NGL — swaps		—			—

	$	(4,427	)	$	(13,764	)

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 our accompanying consolidated balance sheets (in thousands):


	June 30, 2011								December 31, 2010
	Assets		(Liabilities)						Assets		(Liabilities)
						Net								Net
	Carrying		Carrying			Carrying			Carrying		Carrying			Carrying
	Value		Value			Value			Value		Value			Value
Derivatives that qualify for cash flow hedge accounting:
Swaps ⁽¹⁾	$	4,184	$	—		$	4,184		$	—	$	—		$	—
Collars⁽¹⁾		103,907		—			103,907			164,933		—			164,933
Collars ⁽¹⁾ — discontinued operations		—		—			—			8,195		—			8,195

	$	108,091	$	—		$	108,091		$	173,128	$	—		$	173,128


Derivatives that do not qualify for hedge accounting:
Swaps ⁽¹⁾	$	13,750	$	—		$	13,750		$	—	$	—		$	—
Collars⁽¹⁾		6,430		(15,830	)		(9,400	)		17,259		(12,052	)		5,207
Call options⁽¹⁾		—		(51,351	)		(51,351	)		—		(60,297	)		(60,297	)
Basis swaps⁽¹⁾		—		—			—			—		(352	)		(352	)

	$	20,180	$	(67,181	)	$	(47,001	)	$	17,259	$	(72,701	)	$	(55,442	)


⁽¹⁾		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 (loss) included in the accompanying consolidated balance sheets are summarized below (in thousands):


	Three Months Ended June 30,												Six Months Ended June 30,
							Realized Gain (Loss)												Realized Gain (Loss)
	Change in Hedge						Reclassified from OCI						Change in Hedge						Reclassified from OCI
	Derivative Fair Value						into Revenue ^(a)						Derivative Fair Value						into Revenue ^(a)
	2011			2010			2011			2010			2011			2010			2011			2010
Swaps	$	4,655		$	—		$	—		$	—		$	2,115		$	—		$	—		$	—
Collars		23,223			(6,887	)		24,285			18,340			22,424			77,930			53,902			19,555
Collars — discontinued operations		—			19			—			—			412			13			8,607			—
Income taxes		(10,454	)		2,611			(9,107	)		(6,969	)		(7,414	)		(29,618	)		(23,441	)		(7,431	)

	$	17,424		$	(4,257	)	$	15,178		$	11,371		$	17,537		$	48,325		$	39,068		$	12,124


^(a)		For realized gains upon contract settlement, the reduction in AOCI is offset by an increase in natural gas, NGL and oil sales. For realized losses upon contract settlement, the increase in AOCI is offset by a decrease in natural gas, NGL 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 included in the accompanying consolidated statements of operations are summarized below (in thousands):


	Three Months Ended June 30,
	Gain (Loss) Recognized in				Gain Recognized in Income				Derivative Fair Value
	Income (Non-hedge Derivatives)				(Ineffective Portion)				(Loss) Income
	2011		2010		2011		2010		2011		2010
Swaps	$	15,613	$	—	$	—	$	—	$	15,613	$	—
Collars		6,452		1,483		7,510		265		13,962		1,748
Call options		23,464		—		—		—		23,464		—
Basis swaps		—		4,798		—		—		—		4,798

Total	$	45,529	$	6,281	$	7,510	$	265	$	53,039	$	6,546


	Six Months Ended June 30,
	Gain (Loss) Recognized in					Gain Recognized in Income					Derivative Fair Value
	Income (Non-hedge Derivatives)					(Ineffective Portion)					(Loss) Income
	2011			2010		2011		2010			2011			2010
Swaps	$	13,750		$	—	$	—	$	—		$	13,750		$	—
Collars		(1,135	)		48,438		9,024		(341	)		7,889			48,097
Call options		(9,391	)		—		—		—			(9,391	)		—
Basis swaps		(43	)		782		—		—			(43	)		782

Total	$	3,181		$	49,220	$	9,024	$	(341	)	$	12,205		$	48,879

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

Fair Value Measurements

6 Months Ended

Jun. 30, 2011

Fair Value Measurements [Abstract]

FAIR VALUE MEASUREMENTS

(13) FAIR VALUE MEASUREMENTS

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

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

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

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

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

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

Fair Values-Recurring

We use a market approach for our 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 presents the fair value hierarchy table for assets and liabilities measured at fair value, on a recurring basis (in thousands):


	Fair Value Measurements at June 30, 2011 Using:
	Quoted Prices in		Significant					Total
	Active Markets		Other			Significant		Carrying
	for Identical		Observable			Unobservable		Value as of
	Assets		Inputs			Inputs		June 30,
	(Level 1)		(Level 2)			(Level 3)		2011
Trading securities held in our deferred compensation plans	$	52,129	$	—		$	—	$	52,129
Derivatives – swaps		—		17,934			—		17,934
– collars		—		94,507			—		94,507
– call options		—		(51,351	)		—		(51,351	)

Our trading securities in Level 1 are exchange-traded and measured at fair value with a market approach using June 30, 2011 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 our accompanying consolidated balance sheets. We elected to adopt the fair value option to simplify our accounting for the investments in our deferred compensation plan. Interest, dividends and mark-to-market gains/losses are included in deferred compensation plan expense in our consolidated statements of operations. For the three months ended June 30, 2011, interest and dividends were $60,000 and mark-to-market was a gain of $5,000. For the three months ended June 30, 2010, interest and dividends were $39,000 and mark-to-market was a gain of $3.2 million. For the six months ended June 30, 2011, interest and dividends were $95,000 and mark-to-market was a gain of $1.3 million. For the six months ended June 30, 2010 interest and dividends were $71,000 and mark-to-market was a gain of $3.8 million. For additional information on the accounting for our deferred compensation plan, see Note 14.

Fair Values-Nonrecurring

We review our long-lived assets to be held and used, including proved natural gas and oil properties, whenever events or circumstances indicate the carrying value of those assets may not be recoverable. Several long-lived assets held for use were evaluated for impairment during 2010 due to reductions in estimated reserves and natural gas prices. The fair value of our onshore Gulf Coast assets in 2010 was measured using an income approach based upon internal estimates of future production levels, prices, drilling and operating costs and discount rates, which are Level 3 inputs. Our projected undiscounted cash flows associated with these assets was less than their carrying value and therefore, we recorded an impairment of $6.5 million in 2010 related to our onshore Gulf Coast proved properties.

The following table presents the value of these assets measured at fair value on a nonrecurring basis (in thousands):


	Six Months Ended June 30,
	2011				2010
					Fair
	Fair Value		Impairment		Value		Impairment
Natural gas and oil properties	$	—	$	—	$	16,075	$	6,505

Fair Values-Reported

The following table presents the carrying amounts and the fair values of our financial instruments as of June 30, 2011 and December 31, 2010 (in thousands):


	June 30, 2011						December 31, 2010
	Carrying			Fair			Carrying			Fair
	Value			Value			Value			Value
Assets:
Commodity swaps, collars, call options and basis swaps	$	65,517		$	65,517		$	123,255		$	123,255
Commodity collars – discontinued operations		—			—			8,195			8,195
Marketable securities^(a)		52,129			52,129			47,794			47,794

Liabilities:
Commodity swaps, collars, call options and basis swaps		(4,427	)		(4,427	)		(13,764	)		(13,764	)
Bank credit facility ^(b)		—			—			(274,000	)		(274,000	)
6.375% senior subordinated notes due 2015 ^(b)		—			—			(150,000	)		(153,000	)
7.5% senior subordinated notes due 2016 ^(b)		—			—			(249,683	)		(259,375	)
7.5% senior subordinated notes due 2017 ^(b)		(250,000	)		(265,625	)		(250,000	)		(263,438	)
7.25% senior subordinated notes due 2018 ^(b)		(250,000	)		(265,000	)		(250,000	)		(263,750	)
8.0% senior subordinated notes due 2019 ^(b)		(287,398	)		(325,500	)		(286,853	)		(326,625	)
6.75% senior subordinated notes due 2020 ^(b)		(500,000	)		(517,500	)		(500,000	)		(515,625	)
5.75% senior subordinated notes due 2021^(b)		(500,000	)		(491,250	)		—			—


^(a)		Marketable securities are held in our deferred compensation plans.

^(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.

Concentration of Credit Risk

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 deemed necessary to limit risk of loss. Our allowance for uncollectible receivables was $3.8 million at June 30, 2011 and $5.0 million at December 31, 2010. Commodity-based contracts expose us to the credit risk of nonperformance by the counterparty to the contracts. As of June 30, 2011, these contracts consist of swaps, collars and call options. This exposure is diversified among major investment grade financial institutions and we have master netting agreements with the counterparties that provide for offsetting payables against receivables from separate derivative contracts. Our derivative counterparties include ten financial institutions, of which all but one are secured lenders in our bank credit facility. Macquarie Bank Limited is the only counterparty not in our bank group. At June 30, 2011 our net derivative receivable includes a receivable from Macquarie Bank Limited of $6.9 million. Our natural gas and oil properties provide collateral under our credit facility and our derivative exposure. None of our derivative contracts have margin requirements or collateral provisions that would require funding prior to the scheduled cash settlement date.

- 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
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-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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+ Details

Employee Benefit and Equity Plans

6 Months Ended

Jun. 30, 2011

Employee Benefit and Equity Plans [Abstract]

EMPLOYEE BENEFIT AND EQUITY PLANS

(14)

EMPLOYEE BENEFIT AND EQUITY PLANS

We have two active equity-based stock compensation plans. Under these plans, incentive and non-qualified stock options, SARs, restricted stock, restricted stock units, phantom stock and various other awards may be issued to employees and directors pursuant to decisions of the Compensation Committee, which is made up of non-employee, independent directors from the Board of Directors.

Equity Awards – SARs/Stock Options

All awards granted have been issued at prevailing market prices at the time of the grant. Information with respect to stock option/SARs activity is summarized below:


				Weighted
				Average
	Shares			Exercise Price
Outstanding at December 31, 2010		6,461,839		$	37.20
Granted		841,620			51.15
Exercised		(1,507,274	)		27.00
Expired/forfeited		(193,940	)		54.31

Outstanding at June 30, 2011		5,602,245		$	41.44

The weighted average fair value of a SAR to purchase one share of common stock granted during 2011 was $18.21. The fair value of each SAR granted during 2011 was estimated as of the date of grant using the Black-Scholes-Merton option-pricing model based on the following average assumptions: risk-free interest rate of 1.4%; dividend yield of 0.3%; expected volatility of 47% and an expected life of 3.6 years. Of the 5.6 million stock option/SARs outstanding at June 30, 2011, 658,000 are stock options and 4.9 million are SARs.

Equity Awards-Restricted Stock Units

Beginning in first quarter 2011, the compensation committee began granting restricted stock units under our equity-based stock compensation plans. These restricted stock units 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. Net shares will be issued to employees as the restricted stock units vest. A summary of the non-vested restricted stock unit awards at June 30, 2011 is presented below:


				Weighted
				Average
				Grant Date
	Shares			Fair Value
Non-vested restricted stock units outstanding at December 31, 2010		—		$	—
Granted		329,399			49.46
Vested		(36,995	)		49.22
Expired/forfeited		(8,472	)		49.18

Non-vested restricted stock units outstanding at June 30, 2011		283,932		$	49.50

Liability Awards-Restricted Stock

These restricted stock shares are placed into our deferred compensation plan when granted. During the first six months of 2011, 334,000 shares of restricted stock (or non-vested shares) were issued to certain employees at an average price of $51.10 with a three-year vesting period and 15,500 shares were granted to directors at an average price of $52.35 with immediate vesting. In the first six months of 2010, we issued 385,000 shares of restricted stock as compensation to employees at an average price of $45.97 with a three-year vesting period and 21,000 shares were granted to our directors at an average price of $45.51 with immediate vesting. All restricted stock awards held in our deferred compensation plans are classified as a liability award and remeasured at fair value each reporting period. This mark-to-market is included in deferred compensation plan expense in our accompanying consolidated statements of operations (see additional discussion below). All awards granted have been issued at prevailing market prices at the time of the grant and the vesting of these shares is based upon an employee’s continued employment with us.

A summary of the status of our non-vested restricted stock outstanding at June 30, 2011 is presented below:


				Weighted
				Average Grant
	Shares			Date Fair Value
Non-vested restricted stock outstanding at December 31, 2010		582,751		$	44.81
Granted		349,480			51.16
Vested		(213,929	)		46.83
Forfeited		(21,176	)		44.87

Non-vested restricted stock outstanding at June 30, 2011		697,126		$	47.37

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 such amounts in Range common stock or make other investments at the individual’s discretion. The assets of the plan 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. Our stock granted and held in the Rabbi Trust is treated as a liability award as employees are allowed to take withdrawals either in cash or in Range stock. The liability associated with the vested portion of Range stock 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 Range common stock, are invested in marketable securities and reported at market value in other assets in the accompanying consolidated balance sheets. Changes in the market value of the marketable securities are charged or credited to deferred compensation plan expense each quarter. The deferred compensation liability included in our consolidated balance sheets reflects the vested market value of the marketable securities and Range common stock held in the Rabbi Trust. We recorded non-cash, mark-to-market income related to our deferred compensation plan of $5.8 million in the three months ended June 30, 2011 compared to income of $14.1 million in the same period of 2010. We recorded non-cash mark-to-market expense related to our deferred compensation plan of $24.9 million in the six months ended June 30, 2011 compared to income of $19.8 million in the same period of 2010.

- 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 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.

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-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
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-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

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-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

Supplemental Cash Flow Information

6 Months Ended

Jun. 30, 2011

Supplemental Cash Flow Elements [Abstract]

SUPPLEMENTAL CASH FLOW INFORMATION

(15) SUPPLEMENTAL CASH FLOW INFORMATION


	Six Months Ended
	June 30,
	2011		2010
	(in thousands)
Non-cash investing and financing activities included:
Asset retirement costs capitalized, net	$	12,717	$	864
Unproved property purchased with stock^(a)	$	—	$	20,000
Net cash provided from operating activities included:
Interest paid	$	68,002	$	58,457
Income taxes paid (refunded)	$	308	$	(684	)


^(a)		Six months ended June 30, 2010 included shares that were issued in January 2010 while the value was accrued and included in costs incurred for the year ended December 31, 2009.

Commitments and Contingencies

6 Months Ended

Jun. 30, 2011

Commitments and Contingencies [Abstract]

COMMITMENTS AND CONTINGENCIES

(16) COMMITMENTS AND CONTINGENCIES

Litigation

We are involved in various legal actions, claims and other regulatory proceedings arising in the ordinary course of our business. While the outcome of these lawsuits cannot be predicted with certainty, we do not expect these matters to have a material adverse effect on our financial position, cash flows or results of operations. If an unfavorable ruling were to occur, there exists the possibility of a material adverse impact on our net income or loss in the period in which the ruling occurs. We provide accruals for litigation and claims if we determine that the loss is probable and the amount can be reasonably estimated.

Transportation Contracts

As of June 30, 2011, future minimum transportation fees under our gas transportation commitments are as follows (in thousands):


	Transportation
	Commitments
2011 (remaining)	$	45,315
2012		90,361
2013		89,768
2014		88,826
2015		86,361
Thereafter		503,940

	$	904,571

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: 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 2: 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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 7: 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

+ Details

Capitalized Costs and Accumulated Depreciation Depletion and Amortization

6 Months Ended

Jun. 30, 2011

Extractive Industries [Abstract]

CAPITALIZED COSTS AND ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION


(17)		CAPITALIZED COSTS AND ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION^(a)


	June 30,			December 31,
	2011			2010
	(in thousands)
Natural gas and oil properties:
Properties subject to depletion	$	5,326,056		$	4,742,248
Unproved properties		673,609			648,143

Total		5,999,665			5,390,391
Accumulated depreciation, depletion and amortization		(1,447,300	)		(1,306,378	)

Net capitalized costs	$	4,552,365		$	4,084,013


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

Costs Incurred for Property Acquisitions Exploration and Development

6 Months Ended

Jun. 30, 2011

Extractive Industries [Abstract]

COSTS INCURRED FOR PROPERTY ACQUISITIONS, EXPLORATION AND DEVELOPMENT

(18) COSTS INCURRED FOR PROPERTY ACQUISITIONS, EXPLORATION AND DEVELOPMENT^(a)


	Six Months		Year
	Ended		Ended
	June 30,		December 31,
	2011		2010
	(in thousands)
Acquisitions:
Unproved leasehold	$	—	$	3,697
Proved properties		—		130,767
Asset retirement obligations		—		556
Acreage purchases		67,140		151,572
Development		476,702		727,720
Exploration:
Drilling		68,936		50,433
Expense		36,513		56,298
Stock-based compensation expense		2,266		4,209
Gas gathering facilities:
Development		11,540		19,627

Subtotal		663,097		1,144,879
Asset retirement obligations		12,716		(6,370	)

Total costs incurred – continuing operations		675,813		1,138,509
Discontinued operations		3,502		73,369

Total costs incurred	$	679,315	$	1,211,878


^(a)		Includes costs incurred whether capitalized or expensed and include our Barnett operations.

Office Closing and Exit Activities

6 Months Ended

Jun. 30, 2011

Office Closing and Exit Activities [Abstract]

OFFICE CLOSING AND EXIT ACTIVITIES


(19)		OFFICE CLOSING AND EXIT ACTIVITIES

In February 2010, we entered into an agreement to sell our natural gas properties in Ohio. We closed approximately 90% of the sale in March 2010 and closed the remainder of the sale in June 2010. The first quarter 2010 includes $5.1 million accrued severance costs, which is reflected in termination costs in the accompanying consolidated statements of operations. As part of their severance agreement, our Ohio employees’ vesting of SARs and restricted stock grants was accelerated, increasing termination costs for stock compensation expense in first quarter 2010 by approximately $2.8 million.

The following table details our exit activities, which are included in accrued liabilities in the accompanying consolidated balance sheets as of June 30, 2011 and December 31, 2010 (in thousands):


	Six Months			Year
	Ended			Ended
	June 30,			December 31,
	2011			2010
	(in thousands)
Balance at beginning of period	$	1,092		$	1,568
Accrued one-time termination costs		—			5,138
Office lease		(117	)		514
Payments		(742	)		(6,128	)

Balance at end of period	$	233		$	1,092

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References + Details

New Accounting Standards (Policies)	6 Months Ended
New Accounting Standards (Policies)	Jun. 30, 2011
New Accounting Standards [Abstract]
Fair Value Measurement and Disclosure Requirements	In May 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2011-04, “Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and International Financial Reporting Standards (“IFRS”).” This pronouncement was issued to provide a consistent definition of fair value and ensure that the fair value measurement and disclosure requirements are similar between U.S. GAAP and IFRS. ASU 2011-04 changes certain fair value measurement principles and enhances the disclosure requirements, particularly for Level 3 fair value measurements. This pronouncement is effective for reporting periods beginning on or after December 15, 2011, with early adoption prohibited. The new guidance will require prospective application. We are currently evaluating the effect that the provisions of this pronouncement will have on our financial statements.
Presentation of Comprehensive Income	In June 2011, the FASB issued ASU No. 2011-05, “Presentation of Comprehensive Income” which was issued to enhance comparability between entities that report under U.S. GAAP and IFRS, and to provide a more consistent method of presenting non-owner transactions that affect an entity’s equity. ASU 2011-05 eliminates the option to report other comprehensive income and its components in the statement of changes in stockholders’ equity and requires an entity to present the total of comprehensive income, the components of net income and the components of other comprehensive income either in a single continuous statement or in two separate but consecutive statements. This pronouncement is effective for fiscal years, and interim periods within those years, beginning after December 15, 2011. Early adoption of the new guidance is permitted and full retrospective application is required. We are currently evaluating the effect that the provisions of this pronouncement will have on our financial statements.

Discontinued Operations (Tables)

6 Months Ended

Jun. 30, 2011

Discontinued Operations [Abstract]

Components of discontinued operations


	Three Months Ended June 30,					Six Months Ended June 30,
	2011		2010			2011		2010
Revenues and other income
Natural gas, NGL and oil sales	$	10,777	$	33,631		$	53,034	$	82,718
Transportation and gathering		1		11			6		23
Gain on the sale of assets		3,820		—			3,820		955
Other		—		—			4		—

Total revenues and other income		14,598		33,642			56,864		83,696


Costs and expenses
Direct operating		2,169		8,604			10,446		17,808
Production and ad valorem taxes		184		2,427			1,250		3,955
Exploration		5		53			37		549
Abandonment and impairment of unproved properties		—		3,770			—		9,626
Interest expense		3,715		9,508			14,791		18,864
Depletion, depreciation and amortization		14		23,184			8,894		47,003

Total costs and expenses		6,087		47,546			35,418		97,805


Income (loss) from discontinued operations before income taxes		8,511		(13,904	)		21,446		(14,109	)

Income tax expense (benefit)
Current		—		—			—		—
Deferred		2,994		(5,310	)		7,531		(5,388	)

Total income tax expense (benefit)		2,994		(5,310	)		7,531		(5,388	)


Net income (loss) from discontinued operations	$	5,517	$	(8,594	)	$	13,915	$	(8,721	)

Composition of assets and liabilities of discontinued operations


	June 30,		December 31,
	2011		2010
Composition of assets of discontinued operations:
Natural gas and oil properties, net	$	12,546	$	838,044
Transportation and field assets, net		—		684
Accounts receivable		3,805		29,300
Unrealized derivative gain		—		8,195
Inventory and other		—		81

Total assets of discontinued operations	$	16,351	$	876,304


Composition of liabilities of discontinued operations:
Account payable	$	12,592	$	23,366
Accrued liabilities		6,789		9,596

Total current liabilities of discontinued operations	$	19,381	$	32,962


Asset retirement obligations	$	—	$	1,980
Other liabilities		—		1,921

Total long-term liabilities of discontinued operations	$	—	$	3,901

Income Taxes (Tables)

6 Months Ended

Jun. 30, 2011

Income Taxes [Abstract]

Income tax (benefit) expense from continuing operations


	Three Months Ended						Six Month Ended
	June 30,						June 30,
	2011			2010			2011			2010

Income tax expense	$	32,703		$	11,763		$	12,806		$	60,775
Effective tax rate		41.7	%		40.0	%		50.9	%		38.9	%

Income From Continuing Operations Per Common Share (Tables)

6 Months Ended

Jun. 30, 2011

Income from Continuing Operations Per Common Share [Abstract]

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


	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2011			2010			2011			2010
Numerator:
Income from continuing operations	$	45,776		$	17,646		$	12,345		$	95,352
Less: Basic income allocable to participating securities ^(a)		(808	)		(159	)		(220	)		(1,491	)

Basic income from continuing operations attributable to common shareholders		44,968			17,487			12,125			93,861
Diluted adjustments to income allocable to participating securities ^(a)		4			—			1			16

Diluted income from continuing operations attributable to common shareholders	$	44,972		$	17,487		$	12,126		$	93,877


Denominator:
Weighted average common shares outstanding — basic		157,997			156,820			157,772			156,608
Effect of dilutive securities:
Employee stock options and SARs		836			1,652			957			1,993

Weighted average common shares — diluted		158,833			158,472			158,729			158,601


Income from continuing operations per common share:
Basic — net income	$	0.28		$	0.11		$	0.08		$	0.59
Diluted — net income	$	0.28		$	0.11		$	0.08		$	0.59


^(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. Restricted stock awards do not participate in undistributed net losses.

Suspended Exploratory Well Costs (Tables)

6 Months Ended

Jun. 30, 2011

Extractive Industries [Abstract]

Suspended Exploratory Well Costs


	June 30,			December 31,
	2011			2010
Beginning balance at January 1	$	23,908		$	19,052
Additions to capitalized exploratory well costs pending the determination of proved reserves		35,463			28,897
Reclassifications based on determination of proved reserves		(11,619	)		(24,041	)
Capitalized exploratory well costs charged to expense		—			—

Balance at end of period		47,752			23,908
Less exploratory well costs that have been capitalized for a period of one year or less		(42,519	)		(13,181	)

Capitalized exploratory well costs that have been capitalized for a period greater than one year	$	5,233		$	10,727

Number of projects that have exploratory well costs that have been capitalized for a period greater than one year		3			4

Aging of capitalized exploratory well costs that have been suspended for more than one year


	Total		2011		2010		2009		2008

Capitalized exploratory well costs that have been capitalized for more than one year	$	5,233	$	255	$	334	$	3,065	$	1,579

Indebtedness (Tables)

6 Months Ended

Jun. 30, 2011

Indebtedness [Abstract]

Debt Outstanding


	June 30,		December 31,
	2011		2010
Bank debt	$	—	$	274,000

Subordinated debt:
6.375% Senior Subordinated Notes due 2015		—		150,000
7.5% Senior Subordinated Notes due 2016, net of discount		—		249,683
7.5% Senior Subordinated Notes due 2017		250,000		250,000
7.25% Senior Subordinated Notes due 2018		250,000		250,000
8.0% Senior Subordinated Notes due 2019, net of discount		287,398		286,853
6.75% Senior Subordinated Notes due 2020		500,000		500,000
5.75% Senior Subordinated Notes due 2021		500,000		—

Total debt	$	1,787,398	$	1,960,536

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

+ Details

Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 30, 2011

Asset Retirement Obligation [Abstract]

Asset Retirement Obligations


	Six Months
	Ended
	June 30,
	2011
Beginning of period — continuing operations	$	60,693
Liabilities incurred		1,447
Liabilities settled		(1,625	)
Accretion expense — continuing operations		2,580
Change in estimate		11,270

End of period — continuing operations	$	74,365

Capital Stock (Tables)

6 Months Ended

Jun. 30, 2011

Capital Stock [Abstract]

Capital Stock


	Six Months		Year
	Ended		Ended
	June 30,		December 31,
	2011		2010
Beginning balance		159,909,052		158,118,937
Stock options/SARs exercised		558,161		991,988
Restricted stock grants		326,591		405,127
Treasury shares issued		28,903		12,771
Shares issued for acreage purchases		—		380,229

Ending balance		160,822,707		159,909,052

Derivative Activities (Tables)

6 Months Ended

Jun. 30, 2011

Derivative Activities [Abstract]

Derivative volumes hedged and average hedge prices


			Average
Period	Contract Type	Volume Hedged	Hedge Price
Natural Gas
2012	Swaps	70,192 Mmbtu/day	$	5.00
2011	Collars	333,200 Mmbtu/day	$	5.38-$6.23
2012	Collars	189,641 Mmbtu/day	$	5.32-$5.91
2013	Collars	160,000 Mmbtu/day	$	5.09-$5.65

Crude Oil
2012	Collars	2,000 bbls/day	$	70.00-$80.00
2011	Call options	5,500 bbls/day	$	80.00
2012	Call options	4,700 bbls/day	$	85.00

NGLs (Natural gasoline)
2011	Swaps	7,000 bbls/day	$	104.17
2012	Swaps	5,000 bbls/day	$	102.59

Derivative Fair Value Income


	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2011			2010			2011			2010
Hedge ineffectiveness — realized	$	1,576		$	5		$	2,522		$	(352	)
— unrealized		5,934			260			6,502			11
Change in fair value of derivatives that do not qualify for hedge accounting^(a)		48,139			(4,409	)		8,103			42,169
Realized gain on settlements — gas^{(a) (b)}		3,484			10,690			3,090			7,051
Realized loss on settlements — oil^{(a) (b)}		(6,094	)		—			(8,012	)		—

Derivative fair value income	$	53,039		$	6,546		$	12,205		$	48,879


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

^(b)		These amounts represent the realized gains or losses on settled derivatives that do not qualify for hedge accounting, which before settlement are included in the category described above called change in fair value of derivatives that do not qualify for hedge accounting.

Combined fair value of derivatives, by Consolidated balance sheet


	June 30,			December 31,
	2011			2010
Derivative assets:
Natural gas — collars	$	107,258		$	155,159
— collars — discontinued operations		—			8,195
— swaps		4,014			—
Crude oil — collars		(15,830	)		—
— call options		(43,675	)		(31,904	)
NGL — swaps		13,750			—

	$	65,517		$	131,450


Derivative liabilities:
Natural gas — collars	$	3,079		$	27,032
— basis swaps		—			(352	)
— swaps		169			—
Crude oil — collars		—			(12,051	)
— call options		(7,675	)		(28,393	)
NGL — swaps		—			—

	$	(4,427	)	$	(13,764	)

Derivative Gross Assets and Gross Liabilities


	June 30, 2011								December 31, 2010
	Assets		(Liabilities)						Assets		(Liabilities)
						Net								Net
	Carrying		Carrying			Carrying			Carrying		Carrying			Carrying
	Value		Value			Value			Value		Value			Value
Derivatives that qualify for cash flow hedge accounting:
Swaps ⁽¹⁾	$	4,184	$	—		$	4,184		$	—	$	—		$	—
Collars⁽¹⁾		103,907		—			103,907			164,933		—			164,933
Collars ⁽¹⁾ — discontinued operations		—		—			—			8,195		—			8,195

	$	108,091	$	—		$	108,091		$	173,128	$	—		$	173,128


Derivatives that do not qualify for hedge accounting:
Swaps ⁽¹⁾	$	13,750	$	—		$	13,750		$	—	$	—		$	—
Collars⁽¹⁾		6,430		(15,830	)		(9,400	)		17,259		(12,052	)		5,207
Call options⁽¹⁾		—		(51,351	)		(51,351	)		—		(60,297	)		(60,297	)
Basis swaps⁽¹⁾		—		—			—			—		(352	)		(352	)

	$	20,180	$	(67,181	)	$	(47,001	)	$	17,259	$	(72,701	)	$	(55,442	)


⁽¹⁾		Included in unrealized derivative gain or loss in the accompanying consolidated balance sheets.

Effects of cash flow hedges and other hedges on accumulated other comprehensive income (loss)


	Three Months Ended June 30,												Six Months Ended June 30,
							Realized Gain (Loss)												Realized Gain (Loss)
	Change in Hedge						Reclassified from OCI						Change in Hedge						Reclassified from OCI
	Derivative Fair Value						into Revenue ^(a)						Derivative Fair Value						into Revenue ^(a)
	2011			2010			2011			2010			2011			2010			2011			2010
Swaps	$	4,655		$	—		$	—		$	—		$	2,115		$	—		$	—		$	—
Collars		23,223			(6,887	)		24,285			18,340			22,424			77,930			53,902			19,555
Collars — discontinued operations		—			19			—			—			412			13			8,607			—
Income taxes		(10,454	)		2,611			(9,107	)		(6,969	)		(7,414	)		(29,618	)		(23,441	)		(7,431	)

	$	17,424		$	(4,257	)	$	15,178		$	11,371		$	17,537		$	48,325		$	39,068		$	12,124


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

Effects of non-hedge derivatives on consolidated statement of operations


	Three Months Ended June 30,
	Gain (Loss) Recognized in				Gain Recognized in Income				Derivative Fair Value
	Income (Non-hedge Derivatives)				(Ineffective Portion)				(Loss) Income
	2011		2010		2011		2010		2011		2010
Swaps	$	15,613	$	—	$	—	$	—	$	15,613	$	—
Collars		6,452		1,483		7,510		265		13,962		1,748
Call options		23,464		—		—		—		23,464		—
Basis swaps		—		4,798		—		—		—		4,798

Total	$	45,529	$	6,281	$	7,510	$	265	$	53,039	$	6,546


	Six Months Ended June 30,
	Gain (Loss) Recognized in					Gain Recognized in Income					Derivative Fair Value
	Income (Non-hedge Derivatives)					(Ineffective Portion)					(Loss) Income
	2011			2010		2011		2010			2011			2010
Swaps	$	13,750		$	—	$	—	$	—		$	13,750		$	—
Collars		(1,135	)		48,438		9,024		(341	)		7,889			48,097
Call options		(9,391	)		—		—		—			(9,391	)		—
Basis swaps		(43	)		782		—		—			(43	)		782

Total	$	3,181		$	49,220	$	9,024	$	(341	)	$	12,205		$	48,879

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2011

Fair Value Measurements [Abstract]

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


	Fair Value Measurements at June 30, 2011 Using:
	Quoted Prices in		Significant					Total
	Active Markets		Other			Significant		Carrying
	for Identical		Observable			Unobservable		Value as of
	Assets		Inputs			Inputs		June 30,
	(Level 1)		(Level 2)			(Level 3)		2011
Trading securities held in our deferred compensation plans	$	52,129	$	—		$	—	$	52,129
Derivatives – swaps		—		17,934			—		17,934
– collars		—		94,507			—		94,507
– call options		—		(51,351	)		—		(51,351	)

Values of assets measured at fair value on nonrecurring basis


	Six Months Ended June 30,
	2011				2010
					Fair
	Fair Value		Impairment		Value		Impairment
Natural gas and oil properties	$	—	$	—	$	16,075	$	6,505

Carrying Amounts and Fair Values of Financial Instruments


	June 30, 2011						December 31, 2010
	Carrying			Fair			Carrying			Fair
	Value			Value			Value			Value
Assets:
Commodity swaps, collars, call options and basis swaps	$	65,517		$	65,517		$	123,255		$	123,255
Commodity collars – discontinued operations		—			—			8,195			8,195
Marketable securities^(a)		52,129			52,129			47,794			47,794

Liabilities:
Commodity swaps, collars, call options and basis swaps		(4,427	)		(4,427	)		(13,764	)		(13,764	)
Bank credit facility ^(b)		—			—			(274,000	)		(274,000	)
6.375% senior subordinated notes due 2015 ^(b)		—			—			(150,000	)		(153,000	)
7.5% senior subordinated notes due 2016 ^(b)		—			—			(249,683	)		(259,375	)
7.5% senior subordinated notes due 2017 ^(b)		(250,000	)		(265,625	)		(250,000	)		(263,438	)
7.25% senior subordinated notes due 2018 ^(b)		(250,000	)		(265,000	)		(250,000	)		(263,750	)
8.0% senior subordinated notes due 2019 ^(b)		(287,398	)		(325,500	)		(286,853	)		(326,625	)
6.75% senior subordinated notes due 2020 ^(b)		(500,000	)		(517,500	)		(500,000	)		(515,625	)
5.75% senior subordinated notes due 2021^(b)		(500,000	)		(491,250	)		—			—


^(a)		Marketable securities are held in our deferred compensation plans.

^(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.

- Definition

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

+ References

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 14
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: 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 4: 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 5: 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 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 19
-Subparagraph a, b, c(1), d(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13467-108611

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13476-108611

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

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610

+ Details

Employee Benefit and Equity Plans (Tables)

6 Months Ended

Jun. 30, 2011

Employee Benefit and Equity Plans [Abstract]

Stock option and SARs activities


				Weighted
				Average
	Shares			Exercise Price
Outstanding at December 31, 2010		6,461,839		$	37.20
Granted		841,620			51.15
Exercised		(1,507,274	)		27.00
Expired/forfeited		(193,940	)		54.31

Outstanding at June 30, 2011		5,602,245		$	41.44

Non-vested restricted stock units outstanding


				Weighted
				Average
				Grant Date
	Shares			Fair Value
Non-vested restricted stock units outstanding at December 31, 2010		—		$	—
Granted		329,399			49.46
Vested		(36,995	)		49.22
Expired/forfeited		(8,472	)		49.18

Non-vested restricted stock units outstanding at June 30, 2011		283,932		$	49.50

Non-vested restricted stock outstanding


				Weighted
				Average Grant
	Shares			Date Fair Value
Non-vested restricted stock outstanding at December 31, 2010		582,751		$	44.81
Granted		349,480			51.16
Vested		(213,929	)		46.83
Forfeited		(21,176	)		44.87

Non-vested restricted stock outstanding at June 30, 2011		697,126		$	47.37

Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2011

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information


	Six Months Ended
	June 30,
	2011		2010
	(in thousands)
Non-cash investing and financing activities included:
Asset retirement costs capitalized, net	$	12,717	$	864
Unproved property purchased with stock^(a)	$	—	$	20,000
Net cash provided from operating activities included:
Interest paid	$	68,002	$	58,457
Income taxes paid (refunded)	$	308	$	(684	)


^(a)		Six months ended June 30, 2010 included shares that were issued in January 2010 while the value was accrued and included in costs incurred for the year ended December 31, 2009.

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2011

Commitments and Contingencies [Abstract]

Future minimum transportation fees


	Transportation
	Commitments
2011 (remaining)	$	45,315
2012		90,361
2013		89,768
2014		88,826
2015		86,361
Thereafter		503,940

	$	904,571

Capitalized Costs and Accumulated Depreciation Depletion and Amortization (Tables)

6 Months Ended

Jun. 30, 2011

Extractive Industries [Abstract]

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization


	June 30,			December 31,
	2011			2010
	(in thousands)
Natural gas and oil properties:
Properties subject to depletion	$	5,326,056		$	4,742,248
Unproved properties		673,609			648,143

Total		5,999,665			5,390,391
Accumulated depreciation, depletion and amortization		(1,447,300	)		(1,306,378	)

Net capitalized costs	$	4,552,365		$	4,084,013


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

Costs Incurred for Property Acquisition Exploration and Development (Tables)

6 Months Ended

Jun. 30, 2011

Extractive Industries [Abstract]

Costs Incurred for Property Acquisition, Exploration and Development


	Six Months		Year
	Ended		Ended
	June 30,		December 31,
	2011		2010
	(in thousands)
Acquisitions:
Unproved leasehold	$	—	$	3,697
Proved properties		—		130,767
Asset retirement obligations		—		556
Acreage purchases		67,140		151,572
Development		476,702		727,720
Exploration:
Drilling		68,936		50,433
Expense		36,513		56,298
Stock-based compensation expense		2,266		4,209
Gas gathering facilities:
Development		11,540		19,627

Subtotal		663,097		1,144,879
Asset retirement obligations		12,716		(6,370	)

Total costs incurred – continuing operations		675,813		1,138,509
Discontinued operations		3,502		73,369

Total costs incurred	$	679,315	$	1,211,878


^(a)		Includes costs incurred whether capitalized or expensed and include our Barnett operations.

- 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

Office Closing and Exit Activities (Tables)

6 Months Ended

Jun. 30, 2011

Office Closing and Exit Activities [Abstract]

Exit activities included in accrued liabilities in consolidated balance sheet


	Six Months			Year
	Ended			Ended
	June 30,			December 31,
	2011			2010
	(in thousands)
Balance at beginning of period	$	1,092		$	1,568
Accrued one-time termination costs		—			5,138
Office lease		(117	)		514
Payments		(742	)		(6,128	)

Balance at end of period	$	233		$	1,092

Dispositions (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended		9 Months Ended
Dispositions (Details) - USD ($) $ in Thousands	Mar. 31, 2010	Jun. 30, 2011	Jun. 30, 2010	Sep. 30, 2010	Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of oil and gas properties		$ 23,409	$ 318,632
Proceeds used to repay outstanding borrowings under credit facility		764,826	220,000
Percentage of sale closed	90.00%
Accumulated other comprehensive income (loss)		45,940			$ 67,470
Ohio Properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of oil and gas properties			323,000
Gain from sale of oil and gas properties			$ 77,400
Proceeds used to repay outstanding borrowings under credit facility				$ 135,000
Percentage of sale closed	90.00%
Barnett Shale Properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from the sale of natural gas properties		877,000
Gain or loss on sale of natural gas properties		3,800
Loss on derivative contracts		1,700
Accumulated other comprehensive income (loss)		$ 18,800

Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Discontinued Operations (Details) - USD ($) $ in Thousands	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues and other income
Natural gas, NGL and oil sales	$ 256,687	$ 173,153	$ 483,568	$ 360,826
Transportation and gathering	(1,041)	663	(728)	2,744
Gain on the sale of assets	(1,621)	10,176	(1,482)	78,089
Other	(435)	637	642	(938)
Total revenues and other income	306,629	191,175	494,205	489,600
Costs and expenses
Direct operating	28,509	21,171	57,226	43,007
Production and ad valorem taxes	7,550	5,663	14,429	12,205
Exploration	11,592	14,420	38,779	28,559
Abandonment and impairment of unproved properties	18,900	9,727	35,437	16,278
Interest expense	31,383	21,271	56,162	42,202
Depletion, depreciation and amortization	78,294	67,813	150,510	132,620
Total costs and expenses	228,150	161,766	469,054	333,473
Income tax expense (benefit)
Current	8		8
Deferred	32,695	11,763	12,798	60,775
Total income tax expense (benefit)	32,703	11,763	12,806	60,775
Net income (loss) from discontinued operations	5,517	(8,594)	13,915	(8,721)
Discontinued operations [Member]
Revenues and other income
Natural gas, NGL and oil sales	10,777	33,631	53,034	82,718
Transportation and gathering	1	11	6	23
Gain on the sale of assets	3,820		3,820	955
Other			4
Total revenues and other income	14,598	33,642	56,864	83,696
Costs and expenses
Direct operating	2,169	8,604	10,446	17,808
Production and ad valorem taxes	184	2,427	1,250	3,955
Exploration	5	53	37	549
Abandonment and impairment of unproved properties		3,770		9,626
Interest expense	3,715	9,508	14,791	18,864
Depletion, depreciation and amortization	14	23,184	8,894	47,003
Total costs and expenses	6,087	47,546	35,418	97,805
Income (loss) from discontinued operations before income taxes	8,511	(13,904)	21,446	(14,109)
Income tax expense (benefit)
Current	0	0	0	0
Deferred	2,994	(5,310)	7,531	(5,388)
Total income tax expense (benefit)	2,994	(5,310)	7,531	(5,388)
Net income (loss) from discontinued operations	$ 5,517	$ (8,594)	$ 13,915	$ (8,721)

Discontinued Operations (Details 1) - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Composition of assets of discontinued operations:
Natural gas and oil properties, net	$ 12,546	$ 838,044
Transportation and field assets, net	0	684
Accounts receivable	3,805	29,300
Unrealized derivative gain	0	8,195
Inventory and other	0	81
Total assets of discontinued operations	16,351	876,304
Composition of liabilities of discontinued operations:
Account payable	12,592	23,366
Accrued liabilities	6,789	9,596
Total current liabilities of discontinued operations	19,381	32,962
Asset retirement obligations	0	1,980
Other liabilities	0	1,921
Total long-term liabilities of discontinued operations	$ 0	$ 3,901

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Income tax expense (benefit)
Income tax (benefit) expense	$ 32,703	$ 11,763	$ 12,806	$ 60,775
Effective tax rate	41.70%	40.00%	50.90%	38.90%
Income Taxes (Textuals) [Abstract]
Statutory Tax Rate	35.00%	35.00%	35.00%	35.00%

Income From Continuing Operations Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Numerator:
Income from continuing operations	$ 45,776	$ 17,646	$ 12,345	$ 95,352
Less: Basic income allocable to participating securities	(808)	(159)	(220)	(1,491)
Basic income from continuing operations attributable to common shareholders	44,968	17,487	12,125	93,861
Diluted adjustments to income allocable to participating securities	4		1	16
Diluted income from continuing operations attributable to common shareholders	$ 44,972	$ 17,487	$ 12,126	$ 93,877
Denominator:
Weighted average common shares outstanding - basic	157,997	156,820	157,772	156,608
Effect of dilutive securities:
Employee stock options and SARs	836	1,652	957	1,993
Weighted average common shares - diluted	158,833	158,472	158,729	158,601
Income from continuing operations per common share:
Basic - net income	$ 0.28	$ 0.11	$ 0.08	$ 0.59
Diluted - net income	$ 0.28	$ 0.11	$ 0.08	$ 0.59

Income from Continuing Operations Per Common Share (Details Textuals) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Income from Continuing Operations Per Common Share (Textuals) [Abstract]
Weighted Average Number of Shares, Restricted Stock	2,800,000	2,800,000	2,900,000	2,700,000
Stock appreciation rights excluded from earning per share calculation	860,000	1,100,000	1,000,000	1,100,000

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name 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 2: 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 3: 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 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 Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 6: 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 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 8: 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.

+ Details

Suspended Exploratory Well Costs (Details) $ in Thousands	6 Months Ended	12 Months Ended
Suspended Exploratory Well Costs (Details) $ in Thousands	Jun. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)
Suspended Exploratory Well Costs
Beginning balance at January 1	$ 23,908	$ 19,052
Additions to capitalized exploratory well costs pending the determination of proved reserves	35,463	28,897
Reclassifications based on determination of proved reserves	(11,619)	(24,041)
Capitalized exploratory well costs charged to expense	0	0
Balance at end of period	47,752	23,908
Less exploratory well costs that have been capitalized for a period of one year or less	(42,519)	(13,181)
Capitalized exploratory well costs that have been capitalized for a period greater than one year	$ 5,233	$ 10,727
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year	3	4

Suspended Exploratory Well Costs (Detalis 1) - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Aging of capitalized exploratory well costs that have been suspended for more than one year
Capitalized exploratory well costs that have been capitalized for more than one year	$ 5,233	$ 10,727
Exploratory Well Costs Capitalized In Year 2011 [Member]
Aging of capitalized exploratory well costs that have been suspended for more than one year
Capitalized exploratory well costs that have been capitalized for more than one year	255
Exploratory Well Costs Capitalized in Year 2010 [Member]
Aging of capitalized exploratory well costs that have been suspended for more than one year
Capitalized exploratory well costs that have been capitalized for more than one year	334
Exploratory Well Costs Capitalized in Year 2009 [Member]
Aging of capitalized exploratory well costs that have been suspended for more than one year
Capitalized exploratory well costs that have been capitalized for more than one year	3,065
Exploratory Well Costs Capitalized in Year 2008 [Member]
Aging of capitalized exploratory well costs that have been suspended for more than one year
Capitalized exploratory well costs that have been capitalized for more than one year	$ 1,579

Suspended Exploratory Well Costs (Details Textuals) $ in Thousands	Jun. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)
Suspended Exploratory Well Costs (Textuals) [Abstract]
Capitalized exploratory well costs that have been capitalized for more than one year	$ 5,233	$ 10,727
Number of Marcellus Shale wells	2

Indebtedness (Details) - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Indebtedness
Bank debt	$ 0	$ 274,000
Subordinated debt:
Subordinated debt	1,787,398	1,686,536
Total debt	1,787,398	1,960,536
6.375% Senior Subordinated Notes due 2015 [Member]
Subordinated debt:
Subordinated debt	0	150,000
7.5% senior subordinated notes due 2016, net of discount [Member]
Subordinated debt:
Subordinated debt	0	249,683
7.5% Senior Subordinated Notes due 2017 [Member]
Subordinated debt:
Subordinated debt	250,000	250,000
7.25% Senior Subordinated Notes due 2018 [Member]
Subordinated debt:
Subordinated debt	250,000	250,000
8.0% senior subordinated notes due 2019, net of discount [Member]
Subordinated debt:
Subordinated debt	287,398	286,853
6.75% Senior Subordinated Notes due 2020 [Member]
Subordinated debt:
Subordinated debt	500,000	500,000
5.75% Senior Subordinated Notes due 2021 [Member]
Subordinated debt:
Subordinated debt	$ 500,000	$ 0

Indebtedness (Details Textuals) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
Indebtedness (Details Textuals) $ in Thousands	May 31, 2011 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)	Jun. 01, 2019	Jun. 01, 2016	Jun. 24, 2011 USD ($)	May 25, 2011 USD ($)	May 11, 2011 USD ($)	Dec. 31, 2010 USD ($)
Debt Instrument [Line Items]
Net proceeds after underwriting discounts and commissions				$ 500,000
Proceeds used to repay outstanding borrowings under credit facility				764,826	$ 220,000
Repayment of subordinate debt				$ 413,332
Maturity date of loan				Feb. 01, 2016
Indebtedness (Textuals) [Abstract]
Interest Costs, Capitalized During Period		$ 0	$ 0	$ 0	$ 0
Bank Credit facility, Borrowing base		2,000,000		2,000,000
Bank Credit Facility Amount		$ 1,500,000		$ 1,500,000
Number of commercial banks included in current bank group		27		27
Percentage holding of commercial banks, Maximum		7.00%		7.00%
Notice period for increase in facility amount				20 days
Outstanding balance under the bank credit facility		$ 0		$ 0							$ 274,000
Undrawn letters of credit		13,900		13,900
Borrowing capacity available under the facility amount		$ 1,500,000		$ 1,500,000
Weighted average interest rate on the bank credit facility		2.00%	2.20%	2.20%	2.20%
Commitment Fee Rate				0.375%
Ratio of debt to EBITDAX		4.25		4.25
Current ratio		1.0		1.0
Loss on early extinguishment of debt		$ (18,580)		$ (18,580)
Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Maximum redemption price of 5.75% notes as a percentage of principal amount		105.75%		105.75%		100.00%	102.875%
Maximum percentage of the original aggregate amount of the 5.75% notes that can be redeemed		35.00%		35.00%
Minimum percentage of original aggregate principal amount of 5.75% percentage notes to remain outstanding immediately after redemption		65.00%		65.00%
Maximum number of days after the date of the closing of the equity offering that the redemption should occur				60 days
6.375% Senior Subordinated Notes due 2015 [Member]
Debt Instrument [Line Items]
Interest Rate on Senior Subordinated Notes		6.375%		6.375%							6.375%
Aggregate principal amount of senior subordinated notes										$ 150,000
Repayment of subordinate debt				$ 112,900
Purchase price of senior subordinate notes as a percentage of principal								102.125%	102.375%
Purchase price of senior subordinate notes								$ 41,100	$ 108,900
7.5% senior subordinated notes due 2016, net of discount [Member]
Debt Instrument [Line Items]
Interest Rate on Senior Subordinated Notes		7.50%		7.50%							7.50%
Aggregate principal amount of senior subordinated notes										$ 250,000
Repayment of subordinate debt				$ 207,100
Purchase price of senior subordinate notes as a percentage of principal								103.75%	104.00%
Purchase price of senior subordinate notes								$ 51,200	$ 198,800
7.5% Senior Subordinated Notes due 2017 [Member]
Debt Instrument [Line Items]
Interest Rate on Senior Subordinated Notes		7.50%		7.50%							7.50%
7.25% Senior Subordinated Notes due 2018 [Member]
Debt Instrument [Line Items]
Interest Rate on Senior Subordinated Notes		7.25%		7.25%							7.25%
8.0% senior subordinated notes due 2019, net of discount [Member]
Debt Instrument [Line Items]
Interest Rate on Senior Subordinated Notes		8.00%		8.00%							8.00%
6.75% Senior Subordinated Notes due 2020 [Member]
Debt Instrument [Line Items]
Interest Rate on Senior Subordinated Notes		6.75%		6.75%							6.75%
5.75% Senior Subordinated Notes due 2021 [Member]
Debt Instrument [Line Items]
Interest Rate on Senior Subordinated Notes		5.75%		5.75%
Aggregate principal amount of senior subordinated notes	$ 500,000
Net proceeds after underwriting discounts and commissions	$ 491,300
Maximum [Member]
Line of Credit Facility [Line Items]
Annual rate of commitment fee paid on the undrawn balance				0.375%
Spread for Alternate Base Rate		1.50%		1.50%
Spread for Libor Rate		2.50%		2.50%
Minimum [Member]
Line of Credit Facility [Line Items]
Annual rate of commitment fee paid on the undrawn balance				0.50%
Spread for Alternate Base Rate		0.50%		0.50%
Spread for Libor Rate		1.50%		1.50%

Asset Retirement Obligations (Details) $ in Thousands	6 Months Ended
Asset Retirement Obligations (Details) $ in Thousands	Jun. 30, 2011 USD ($)
Asset Retirement Obligations
Beginning of period - continuing operations	$ 60,693
Liabilities incurred	1,447
Liabilities settled	(1,625)
Accretion expense - continuing operations	2,580
Change in estimate	11,270
End of period - continuing operations	$ 74,365

Capital Stock (Details) - shares	6 Months Ended	12 Months Ended
Capital Stock (Details) - shares	Jun. 30, 2011	Dec. 31, 2010
Capital Stock
Beginning balance	159,909,052	158,118,937
Stock options/SARs exercised	558,161	991,988
Restricted stock grants	326,591	405,127
Treasury shares issued	28,903	12,771
Shares issued for acreage purchases		380,229
Ending balance	160,822,707	159,909,052

- Definition

Number of shares of stock issued during the period pursuant to acquisitions.

+ References + Details

Capital Stock (Details Textuals) - USD ($) $ in Millions	6 Months Ended
Capital Stock (Details Textuals) - USD ($) $ in Millions	Jun. 30, 2011	Dec. 31, 2010
Capital Stock (Textuals) [Abstract]
Authorized capital stock	485,000,000
Common stock, shares authorized	475,000,000	475,000,000
Preferred stock, shares authorized	10,000,000	10,000,000
Repurchase of common stock, approved total	$ 10.0
Remaining common stock, under authorization	$ 6.8

Derivative Activities (Details)	Jun. 30, 2011 USD ($)
Derivative volumes hedged and average hedge prices
Average price of oil call option (per barrel)	83.15
Natural Gas [Member]
Derivative volumes hedged and average hedge prices
Average floor price	5.27
Average cap price	5.93
Average hedge price	5.00
NGL [Member]
Derivative volumes hedged and average hedge prices
Average hedge price	103.24
Collars [Member] \| Crude Oil 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume Hedged	2,000 bbls/day
Average floor price	70.00
Average cap price	80.00
Collars [Member] \| Natural Gas 2011 [Member]
Derivative volumes hedged and average hedge prices
Volume Hedged	333200 Mmbtu/day
Average floor price	5.38
Average cap price	6.23
Collars [Member] \| Natural Gas 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume Hedged	189641 Mmbtu/day
Average floor price	5.32
Average cap price	5.91
Collars [Member] \| Natural Gas 2013 [Member]
Derivative volumes hedged and average hedge prices
Volume Hedged	160,000 Mmbtu/day
Average floor price	5.09
Average cap price	5.65
Swap [Member] \| Natural Gas 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume Hedged	70,192 Mmbtu/day
Average hedge price	5.00
Swap [Member] \| NGL 2011 [Member]
Derivative volumes hedged and average hedge prices
Volume Hedged	7,000 bbls/day
Average hedge price	104.17
Swap [Member] \| NGL 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume Hedged	5,000 bbls/day
Average hedge price	102.59
Call Option [Member] \| Crude Oil 2011 [Member]
Derivative volumes hedged and average hedge prices
Volume Hedged	5,500 bbls/day
Average price of oil call option (per barrel)	80.00
Call Option [Member] \| Crude Oil 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume Hedged	4,700 bbls/day
Average price of oil call option (per barrel)	85.00

Derivative Activities (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Derivative Activities (Details 1) - USD ($) $ in Thousands	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivative Fair Value Income
Hedge ineffectiveness - realized	$ 1,576	$ 5	$ 2,522	$ (352)
Hedge ineffectiveness - unrealized	5,934	260	6,502	11
Change in fair value of derivatives that do not qualify for hedge accounting	48,139	(4,409)	8,103	42,169
Realized gain on settlements - gas	3,484	10,690	3,090	7,051
Realized loss on settlements - oil	(6,094)		(8,012)
Derivative fair value income	$ 53,039	$ 6,546	$ 12,205	$ 48,879

Derivative Activities (Details 2) - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Derivative assets:
Derivative Assets - Commodity collars, swaps, basis swaps and call options	$ 65,517	$ 131,450
Derivative liabilities:
Derivative Liabilities - Commodity collars, swaps, basis swaps and call options	(4,427)	(13,764)
Crude Oil [Member] \| Collars [Member]
Derivative assets:
Derivative Assets - Commodity collars, swaps, basis swaps and call options	(15,830)	0
Derivative liabilities:
Derivative Liabilities - Commodity collars, swaps, basis swaps and call options	0	(12,051)
Crude Oil [Member] \| Call Option [Member]
Derivative assets:
Derivative Assets - Commodity collars, swaps, basis swaps and call options	(43,675)	(31,904)
Derivative liabilities:
Derivative Liabilities - Commodity collars, swaps, basis swaps and call options	(7,675)	(28,393)
Natural Gas [Member] \| Swap [Member]
Derivative assets:
Derivative Assets - Commodity collars, swaps, basis swaps and call options	4,014	0
Derivative liabilities:
Derivative Liabilities - Commodity collars, swaps, basis swaps and call options	169	0
Natural Gas [Member] \| Basis Swap [Member]
Derivative liabilities:
Derivative Liabilities - Commodity collars, swaps, basis swaps and call options	0	(352)
Natural Gas [Member] \| Collars [Member]
Derivative assets:
Derivative Assets - Commodity collars, swaps, basis swaps and call options	107,258	155,159
Derivative liabilities:
Derivative Liabilities - Commodity collars, swaps, basis swaps and call options	3,079	27,032
Natural Gas [Member] \| Collars discontinued operations [Member]
Derivative assets:
Derivative Assets - Commodity collars, swaps, basis swaps and call options	0	8,195
NGL [Member] \| Swap [Member]
Derivative assets:
Derivative Assets - Commodity collars, swaps, basis swaps and call options	13,750	0
Derivative liabilities:
Derivative Liabilities - Commodity collars, swaps, basis swaps and call options	$ 0	$ 0

Derivative Activities (Details 3) - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Derivatives that qualify for cash flow hedge accounting :
Assets Carrying Value	$ 108,091	$ 173,128
Liabilities Carrying Value	0	0
Net Carrying Value	108,091	173,128
Derivatives that do not qualify for hedge accounting :
Assets Carrying Value	20,180	17,259
Liabilities Carrying Value	(67,181)	(72,701)
Net Carrying Value	(47,001)	(55,442)
Basis Swap [Member]
Derivatives that do not qualify for hedge accounting :
Assets Carrying Value	0	0
Liabilities Carrying Value	0	(352)
Net Carrying Value	0	(352)
Collars [Member]
Derivatives that qualify for cash flow hedge accounting :
Assets Carrying Value	103,907	164,933
Liabilities Carrying Value	0	0
Net Carrying Value	103,907	164,933
Derivatives that do not qualify for hedge accounting :
Assets Carrying Value	6,430	17,259
Liabilities Carrying Value	(15,830)	(12,052)
Net Carrying Value	(9,400)	5,207
Swap [Member]
Derivatives that qualify for cash flow hedge accounting :
Assets Carrying Value	4,184	0
Liabilities Carrying Value	0	0
Net Carrying Value	4,184	0
Derivatives that do not qualify for hedge accounting :
Assets Carrying Value	13,750	0
Liabilities Carrying Value	0	0
Net Carrying Value	13,750	0
Collars discontinued operations [Member]
Derivatives that qualify for cash flow hedge accounting :
Assets Carrying Value	0	8,195
Liabilities Carrying Value	0	0
Net Carrying Value	0	8,195
Call Option [Member]
Derivatives that do not qualify for hedge accounting :
Assets Carrying Value	0	0
Liabilities Carrying Value	(51,351)	(60,297)
Net Carrying Value	$ (51,351)	$ (60,297)

Derivative Activities (Details 4) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Derivative Activities (Details 4) - USD ($) $ in Thousands	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Effects of cash flow hedges and other hedges on accumulated other comprehensive income (loss)
Change in unrealized deferred hedging gains, Tax Effect	$ (10,454)	$ 2,611	$ (7,414)	$ (29,618)
Realized Gain Reclassified from AOCI into Revenue, Income taxes	(9,107)	(6,969)	(23,441)	(7,431)
Change in Hedge Derivative Fair Value, effects of cash flow hedges on accumulated other comprehensive income (loss), total	17,424	(4,257)	17,537	48,325
Realized Gain Reclassified from AOCI into Revenue, effects of cash flow hedges on accumulated other comprehensive income (loss), total	15,178	11,371	39,068	12,124
Collars [Member]
Effects of cash flow hedges and other hedges on accumulated other comprehensive income (loss)
Change in Hedge Derivative Fair Value	23,223	(6,887)	22,424	77,930
Realized Gain Reclassified from AOCI into Revenue	24,285	18,340	53,902	19,555
Swap [Member]
Effects of cash flow hedges and other hedges on accumulated other comprehensive income (loss)
Change in Hedge Derivative Fair Value	4,655	0	2,115	0
Realized Gain Reclassified from AOCI into Revenue	0	0	0	0
Collars discontinued operations [Member]
Effects of cash flow hedges and other hedges on accumulated other comprehensive income (loss)
Change in Hedge Derivative Fair Value	0	19	412	13
Realized Gain Reclassified from AOCI into Revenue	$ 0	$ 0	$ 8,607	$ 0

Derivative Activities (Details 5) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Derivative Activities (Details 5) - USD ($) $ in Thousands	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Effects of non-hedge derivatives on consolidated statement of operations
Gain (Loss) Recognized in Income (Non-hedge Derivatives)	$ 45,529	$ 6,281	$ 3,181	$ 49,220
Gain Recognized in Income (Ineffective Portion)	7,510	265	9,024	(341)
Derivative fair value (loss) income	53,039	6,546	12,205	48,879
Collars [Member]
Effects of non-hedge derivatives on consolidated statement of operations
Gain (Loss) Recognized in Income (Non-hedge Derivatives)	6,452	1,483	(1,135)	48,438
Gain Recognized in Income (Ineffective Portion)	7,510	265	9,024	(341)
Derivative fair value (loss) income	13,962	1,748	7,889	48,097
Swap [Member]
Effects of non-hedge derivatives on consolidated statement of operations
Gain (Loss) Recognized in Income (Non-hedge Derivatives)	15,613	0	13,750	0
Gain Recognized in Income (Ineffective Portion)	0	0	0	0
Derivative fair value (loss) income	15,613	0	13,750	0
Basis Swap [Member]
Effects of non-hedge derivatives on consolidated statement of operations
Gain (Loss) Recognized in Income (Non-hedge Derivatives)	0	4,798	(43)	782
Gain Recognized in Income (Ineffective Portion)	0	0	0	0
Derivative fair value (loss) income	0	4,798	(43)	782
Call Option [Member]
Effects of non-hedge derivatives on consolidated statement of operations
Gain (Loss) Recognized in Income (Non-hedge Derivatives)	23,464	0	(9,391)	0
Gain Recognized in Income (Ineffective Portion)	0	0	0	0
Derivative fair value (loss) income	$ 23,464	$ 0	$ (9,391)	$ 0

Derivative Activities (Details Textuals)	3 Months Ended		6 Months Ended
Derivative Activities (Details Textuals)	Jun. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)
Derivative Activities (Textuals) [Abstract]
Hedged gas swaps (in bcf)			3,100,000
Hedged NGL swaps			25.6
Hedged gas collars (in bcf)	189.1		189.1
Hedged oil collars	700,000		700,000
Hedged oil call options	2,700,000		2,700,000
Average price of oil call option (per barrel)	83.15		83.15
Derivative assets liabilities at fair value net	$ 61,100,000		$ 61,100,000
Unrealized pre-tax derivative gain			73,500,000
Gains (Losses) in oil and gas sales related to settled hedging transactions	24,300,000	$ 18,300,000	53,900,000	$ 19,600,000
Ineffective unrealized and realized gains (losses) recognized income	7,510,000	265,000	9,024,000	(341,000)
Gains/losses recorded due to the discontinuance of hedge accounting treatment	$ 0	$ 0	$ 0	$ 0
Number of financial institutions with whom we conduct derivative activities			10
Number of secured financial institutions with whom we conduct derivative activities			9
Collar Oil [Member]
Derivative [Line Items]
Average floor price	70.00		70.00
Average cap price	80.00		80.00
Natural Gas [Member]
Derivative [Line Items]
Average floor price	5.27		5.27
Average cap price	5.93		5.93
Average price of SWAP per mcf	5.00		5.00
NGL [Member]
Derivative [Line Items]
Average price of SWAP per mcf	103.24		103.24
2011 [Member]
Derivative [Line Items]
Unrealized pre-tax derivative gain expected to be reclassified into earnings			$ 44,100,000
2012 [Member]
Derivative [Line Items]
Unrealized pre-tax derivative gain expected to be reclassified into earnings			21,900,000
2013 [Member]
Derivative [Line Items]
Unrealized pre-tax derivative gain expected to be reclassified into earnings			$ 7,500,000

Fair Value Measurements (Details) $ in Thousands	Jun. 30, 2011 USD ($)
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	$ 61,100
Fair Value, Measurements, Recurring [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Trading securities held in our deferred compensation plans	52,129
Fair Value, Measurements, Recurring [Member] \| Collars [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	94,507
Fair Value, Measurements, Recurring [Member] \| Swap [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	17,934
Fair Value, Measurements, Recurring [Member] \| Call Option [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	(51,351)
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Trading securities held in our deferred compensation plans	52,129
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets [Member] \| Collars [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	0
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets [Member] \| Swap [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	0
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets [Member] \| Call Option [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	0
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Trading securities held in our deferred compensation plans	0
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs [Member] \| Collars [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	94,507
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs [Member] \| Swap [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	17,934
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs [Member] \| Call Option [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	(51,351)
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Trading securities held in our deferred compensation plans	0
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs [Member] \| Collars [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	0
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs [Member] \| Swap [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	0
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs [Member] \| Call Option [Member]
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value
Derivative assets liabilities at fair value net	$ 0

Fair Value Measurements (Details 1) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Values of assets measured at fair value on a nonrecurring basis
Natural gas and oil properties, fair value	$ 0	$ 16,075
Natural gas and oil properties, impairment	$ 0	$ 6,505

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 26
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 7, 25
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6390789&loc=d3e2420-110228

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

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 958
-SubTopic 225
-Section 45
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6743430&loc=d3e92212-112881

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Impairment
-URI http://asc.fasb.org/extlink&oid=6515133

+ Details

Fair Value Measurements (Details 2) - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Assets:
Commodity swaps, collars, call options and basis swaps	$ 65,517	$ 131,450
Liabilities:
Commodity swaps, collars, call options and basis swaps	(4,427)	(13,764)
Bank debt	0	274,000
Subordinated debt	1,787,398	1,686,536
6.375% Senior Subordinated Notes due 2015 [Member]
Liabilities:
Subordinated debt	0	150,000
7.5% senior subordinated notes due 2016, net of discount [Member]
Liabilities:
Subordinated debt	0	249,683
7.5% Senior Subordinated Notes due 2017 [Member]
Liabilities:
Subordinated debt	250,000	250,000
7.25% Senior Subordinated Notes due 2018 [Member]
Liabilities:
Subordinated debt	250,000	250,000
8.0% senior subordinated notes due 2019, net of discount [Member]
Liabilities:
Subordinated debt	287,398	286,853
6.75% Senior Subordinated Notes due 2020 [Member]
Liabilities:
Subordinated debt	500,000	500,000
Carrying Value [Member]
Assets:
Commodity swaps, collars, call options and basis swaps	65,517	123,255
Commodity collars - discontinued operations	0	8,195
Marketable securities	52,129	47,794
Liabilities:
Commodity swaps, collars, call options and basis swaps	(4,427)	(13,764)
Carrying Value [Member] \| Bank credit facility [Member]
Liabilities:
Bank debt	0	(274,000)
Carrying Value [Member] \| 6.375% Senior Subordinated Notes due 2015 [Member]
Liabilities:
Subordinated debt	0	(150,000)
Carrying Value [Member] \| 7.5% senior subordinated notes due 2016, net of discount [Member]
Liabilities:
Subordinated debt	0	(249,683)
Carrying Value [Member] \| 7.5% Senior Subordinated Notes due 2017 [Member]
Liabilities:
Subordinated debt	(250,000)	(250,000)
Carrying Value [Member] \| 7.25% Senior Subordinated Notes due 2018 [Member]
Liabilities:
Subordinated debt	(250,000)	(250,000)
Carrying Value [Member] \| 8.0% senior subordinated notes due 2019, net of discount [Member]
Liabilities:
Subordinated debt	(287,398)	(286,853)
Carrying Value [Member] \| 6.75% Senior Subordinated Notes due 2020 [Member]
Liabilities:
Subordinated debt	(500,000)	(500,000)
Carrying Value [Member] \| 5.75% Senior Subordinated Notes due 2021 [Member]
Liabilities:
Subordinated debt	(500,000)	0
Fair Value [Member]
Assets:
Commodity swaps, collars, call options and basis swaps	65,517	123,255
Commodity collars - discontinued operations	0	8,195
Marketable securities	52,129	47,794
Liabilities:
Commodity swaps, collars, call options and basis swaps	(4,427)	(13,764)
Fair Value [Member] \| Bank credit facility [Member]
Liabilities:
Bank debt	0	(274,000)
Fair Value [Member] \| 6.375% Senior Subordinated Notes due 2015 [Member]
Liabilities:
Subordinated debt	0	(153,000)
Fair Value [Member] \| 7.5% senior subordinated notes due 2016, net of discount [Member]
Liabilities:
Subordinated debt	0	(259,375)
Fair Value [Member] \| 7.5% Senior Subordinated Notes due 2017 [Member]
Liabilities:
Subordinated debt	(265,625)	(263,438)
Fair Value [Member] \| 7.25% Senior Subordinated Notes due 2018 [Member]
Liabilities:
Subordinated debt	(265,000)	(263,750)
Fair Value [Member] \| 8.0% senior subordinated notes due 2019, net of discount [Member]
Liabilities:
Subordinated debt	(325,500)	(326,625)
Fair Value [Member] \| 6.75% Senior Subordinated Notes due 2020 [Member]
Liabilities:
Subordinated debt	(517,500)	(515,625)
Fair Value [Member] \| 5.75% Senior Subordinated Notes due 2021 [Member]
Liabilities:
Subordinated debt	$ (491,250)	$ 0

Fair Value Measurements (Details Textuals)	3 Months Ended		6 Months Ended
Fair Value Measurements (Details Textuals)	Jun. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)	Dec. 31, 2010 USD ($)
Fair Value Measurements (Textuals) [Abstract]
Interest and dividends	$ 60,000	$ 39,000	$ 95,000	$ 71,000
Mark-to-market gain (loss)	5,000	$ 3,200,000	1,300,000	3,800,000
Oil and gas property impairment				$ 6,505,000
Allowance for uncollectible receivables	3,800,000		$ 3,800,000		$ 5,000,000
Number of financial institutions included in counterparties			10
Number of secured lenders in bank credit facility			9
Net derivative receivable	$ 6,900,000		$ 6,900,000
6.375% Senior Subordinated Notes due 2015 [Member]
Debt Instrument [Line Items]
Interest Rate on Senior Subordinated Notes	6.375%		6.375%		6.375%
7.5% senior subordinated notes due 2016, net of discount [Member]
Debt Instrument [Line Items]
Interest Rate on Senior Subordinated Notes	7.50%		7.50%		7.50%
7.5% Senior Subordinated Notes due 2017 [Member]
Debt Instrument [Line Items]
Interest Rate on Senior Subordinated Notes	7.50%		7.50%		7.50%
7.25% Senior Subordinated Notes due 2018 [Member]
Debt Instrument [Line Items]
Interest Rate on Senior Subordinated Notes	7.25%		7.25%		7.25%
8.0% senior subordinated notes due 2019, net of discount [Member]
Debt Instrument [Line Items]
Interest Rate on Senior Subordinated Notes	8.00%		8.00%		8.00%
6.75% Senior Subordinated Notes due 2020 [Member]
Debt Instrument [Line Items]
Interest Rate on Senior Subordinated Notes	6.75%		6.75%		6.75%

Employee Benefit and Equity Plans (Details)	6 Months Ended
Employee Benefit and Equity Plans (Details)	Jun. 30, 2011 $ / shares shares
Stock option and SARs activities
Beginning Balance, Shares \| shares	6,461,839
Beginning Balance, Weighted Average Exercise Price \| $ / shares	$ 37.20
Granted \| $ / shares	$ 51.15
Granted, Shares \| shares	841,620
Exercised \| $ / shares	$ 27.00
Exercised, Shares \| shares	(1,507,274)
Expired/forfeited \| $ / shares	$ 54.31
Expired/forfeited, Shares \| shares	(193,940)
Ending Balance, Shares \| shares	5,602,245
Ending Balance, Weighted Average Exercise Price \| $ / shares	$ 41.44

Employee Benefit and Equity Plans (Details 1)	6 Months Ended
Employee Benefit and Equity Plans (Details 1)	Jun. 30, 2011 $ / shares shares
Non-vested restricted stock units outstanding
Beginning Balance Non-vested restricted stock, Weighted Average Exercise Price \| $ / shares	$ 44.81
Beginning Balance Non-vested restricted stock, Shares \| shares	582,751
Granted, Shares \| shares	349,480
Granted \| $ / shares	$ 51.16
Forfeited, Shares \| shares	(21,176)
Forfeited \| $ / shares	$ 44.87
Ending Balance Non-vested restricted stock, Weighted Average Exercise Price \| $ / shares	$ 47.37
Ending Balance Non-vested restricted stock, Shares \| shares	697,126
Nonvested Restricted Stock Units [Member]
Non-vested restricted stock units outstanding
Beginning Balance Non-vested restricted stock, Weighted Average Exercise Price \| $ / shares	$ 0.00
Beginning Balance Non-vested restricted stock, Shares \| shares	0
Granted, Shares \| shares	329,399
Granted \| $ / shares	$ 49.46
Vested, Shares \| shares	(36,995)
Vested \| $ / shares	$ 49.22
Forfeited, Shares \| shares	(8,472)
Forfeited \| $ / shares	$ 49.18
Ending Balance Non-vested restricted stock, Weighted Average Exercise Price \| $ / shares	$ 49.50
Ending Balance Non-vested restricted stock, Shares \| shares	283,932

Employee Benefit and Equity Plans (Details 2)	6 Months Ended
Employee Benefit and Equity Plans (Details 2)	Jun. 30, 2011 $ / shares shares
Non-vested restricted stock outstanding
Beginning Balance Non-vested restricted stock, Shares \| shares	582,751
Beginning Balance Non-vested restricted stock, Weighted Average Exercise Price \| $ / shares	$ 44.81
Granted \| $ / shares	$ 51.16
Granted, Shares \| shares	349,480
Vested \| $ / shares	$ 46.83
Vested, Shares \| shares	(213,929)
Forfeited \| $ / shares	$ 44.87
Forfeited, Shares \| shares	(21,176)
Ending Balance Non-vested restricted stock, Shares \| shares	697,126
Ending Balance Non-vested restricted stock, Weighted Average Exercise Price \| $ / shares	$ 47.37

- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References + Details

Employee Benefit and Equity Plans (Textuals)	3 Months Ended		6 Months Ended
Employee Benefit and Equity Plans (Textuals)	Jun. 30, 2011 USD ($) shares	Jun. 30, 2010 USD ($)	Jun. 30, 2011 USD ($) $ / shares shares	Jun. 30, 2010 USD ($) shares	Dec. 31, 2010 shares
Employee Benefit and Equity Plans (Textuals) [Abstract]
Weighted average grant date fair value of SARs granted \| $ / shares			$ 18.21
Risk-free interest rate			1.40%
Dividend yield			0.30%
Expected volatility			47.00%
Expected life in years			3.6
Number of stock option and SARs outstanding	5,602,245		5,602,245		6,461,839
Number of stock option outstanding	658,000		658,000
Number of SARs outstanding	4,900,000		4,900,000
Average price of shares granted to employees \| $			51.10	45.97
Vesting period of shares granted to employees			P3Y	P3Y
Non-cash, Mark-to-market income (loss) related to deferred compensation plan \| $	$ 5,800,000	$ 14,100,000	$ (24,900,000)	$ 19,800,000
Vesting period of RSUs			3 years
Average price of shares granted to directors \| $			52.35	45.51
Employee [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Shares granted			334,000	385,000
Director [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Shares granted			15,500	21,000

Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Non-cash investing and financing activities included:
Asset retirement costs capitalized, net	$ 12,717	$ 864
Unproved property purchased with stock		20,000
Net cash provided from operating activities included:
Interest paid	68,002	58,457
Income taxes paid (refunded)	$ 308	$ (684)

Commitments and Contingencies (Details) $ in Thousands	Jun. 30, 2011 USD ($)
Future minimum transportation fees
2011 (remaining)	$ 45,315
2012	90,361
2013	89,768
2014	88,826
2015	86,361
Thereafter	503,940
Total	$ 904,571

Capitalized Costs and Accumulated Depreciation Depletion and Amortization (Details) - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Natural gas and oil properties:
Properties subject to depletion	$ 5,326,056	$ 4,742,248
Unproved properties	673,609	648,143
Total	5,999,665	5,390,391
Accumulated depreciation, depletion and amortization	(1,447,300)	(1,306,378)
Net capitalized costs	$ 4,552,365	$ 4,084,013

Costs Incurred for Property Acquisitions Exploration and Development (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Acquisitions:
Unproved leasehold		$ 3,697
Proved properties		130,767
Asset retirement obligations		556
Acreage purchases	$ 67,410	151,572
Development	476,702	727,720
Exploration:
Drilling	68,936	50,433
Expense	36,513	56,298
Stock-based compensation expense	2,266	4,209
Gas gathering facilities:
Development	11,540	19,627
Subtotal	663,097	1,144,879
Asset retirement obligations	12,716	(6,370)
Total costs incurred - continuing operations	675,813	1,138,509
Discontinued operations	3,502	73,369
Total costs incurred	$ 679,315	$ 1,211,878

Office Closing and Exit Activities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2010	Jun. 30, 2011	Dec. 31, 2010
Exit activities included in accrued liabilities in consolidated balance sheet
Beginning Balance	$ 1,568	$ 1,092	$ 1,568
Accrued one-time termination costs	$ 5,100		5,138
Office lease		(117)	514
Payments		(742)	(6,128)
Ending Balance		$ 233	$ 1,092

Office Closing and Exit Activities (Details Textuals) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2010	Mar. 31, 2010	Jun. 30, 2010	Dec. 31, 2010
Restructuring and Related Cost [Line Items]
Increasing in termination costs for stock compensation expense			$ 7,938
Office Closing and Exit Activities (Textuals)
Percentage of sale closed	90.00%
Accrued severance costs		$ 5,100		$ 5,138
Employee Severance [Member]
Restructuring and Related Cost [Line Items]
Increasing in termination costs for stock compensation expense		$ 2,800

- Definition

The charge against earnings in the period, comprised of costs associated with restructuring activities not otherwise specified in the taxonomy pursuant to a duly authorized plan, excluding a discontinued operation as defined by generally accepted accounting principles. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, but excludes costs associated with the retirement of a long-lived asset and severance costs associated with established compensation plans.

+ References + Details