Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating Activities:
Net income (loss)	$ (2,313)	$ 243,718
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depletion, depreciation and amortization	136,528	88,696
Share-based compensation expense	3,252	6,323
Accretion of discount on asset retirement obligations	1,376	1,246
Impairment of oil and natural gas properties	0	10,707
Income from equity method investments	(701)	(24,079)
(Gain) loss on derivative financial instruments	57,740	(11,732)
Cash settlements (payments) of derivative financial instruments	(34,469)	17,511
Amortization of deferred financing costs and discount on debt issuance	7,697	6,597
Gain on divestitures and other non-operating items	0	(186,350)
Effect of changes in:
Accounts receivable	30,796	17,728
Other current assets	(577)	(1,786)
Accounts payable and other current liabilities	68,793	2,653
Net cash provided by operating activities	268,122	171,232
Investing Activities:
Additions to oil and natural gas properties, gathering assets and equipment	(197,341)	(132,363)
Property acquisitions	(426)	(33,390)
Proceeds from disposition of property and equipment	76,266	613,090
Restricted cash	5,349	27,543
Net changes in advances to joint ventures	(10,540)	8,276
Equity method investments	1,749	(104)
Net cash provided by (used in) investing activities	(124,943)	483,052
Financing Activities:
Borrowings under credit agreements	0	46,757
Repayments under credit agreements	(882,424)	(644,541)
Proceeds received from 2022 Notes	500,000	0
Proceeds from issuance of common stock, net	271,772	42
Payment of common stock dividends	(27,066)	(21,479)
Deferred financing costs and other	(10,066)	(265)
Net cash provided by (used in) financing activities	(147,784)	(619,486)
Net increase (decrease) in cash	(4,605)	34,798
Cash at beginning of period	50,483	45,644
Cash at end of period	45,878	80,442
Supplemental Cash Flow Information:
Cash interest payments	39,576	37,059
Income tax payments	0	0
Supplemental non-cash investing and financing activities:
Capitalized share-based compensation	2,955	3,055
Capitalized interest	10,255	9,817
Issuance of common stock for director services	129	38
Accrued restricted stock dividends	45	201
Debt assumed upon formation of Compass, net	$ 0	$ 58,613