CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities
Net loss	$ (81,559)	$ (41,821)
Adjustments to reconcile net loss to net cash provided by operating activities:
Gains (Losses) on Extinguishment of Debt	0	29,157
Depreciation, depletion and amortization	143,624	115,905
Asset Impairment Charges	117,908	0
Accretion of firm transportation obligation	584	856
Derivative contracts:
Net losses (gains)	58,327	(827)
Cash settlements, net	(10,279)	5,790
Deferred income tax benefit	(42,452)	(22,471)
(Gain) loss on sales of assets, net	(56,775)	293
Non-cash exploration expense	6,579	10,408
Non-cash interest expense	2,051	1,885
Share-based compensation (equity-classified)	1,651	3,771
Other, net	281	82
Changes in operating assets and liabilities, net	(40,747)	26,723
Net cash provided by operating activities	99,193	129,751
Cash flows from investing activities
Payments to Acquire Businesses, Net of Cash Acquired	0	(358,239)
Payments To Settle Obligations Assumed In Acquisition Net	0	(36,310)
Capital expenditures - property and equipment	(350,580)	(229,319)
Proceeds from Sale of Productive Assets	96,632	867
Net cash used in investing activities	(253,948)	(623,001)
Proceeds from Issuance of Senior Long-term Debt	0	775,000
Repayments of Debt	0	(319,090)
Cash flows from financing activities
Proceeds from Issuance of Convertible Preferred Stock	313,646	0
Payments Made To Induce Conversion Of Preferred Stock	(3,368)	0
Proceeds from revolving credit facility borrowings	302,000	153,000
Repayment of revolving credit facility borrowings	(453,000)	(86,000)
Payments of Debt Issuance Costs	(151)	(24,698)
Dividends paid on preferred stock	(3,836)	(3,412)
Other, net	1,085	(110)
Net cash provided by financing activities	156,376	494,690
Net decrease (increase) in cash and cash equivalents	1,621	1,440
Cash and cash equivalents - beginning of period	23,474	17,650
Cash and cash equivalents - end of period	25,095	19,090
Cash paid for:
Interest	47,034	23,215
Income taxes (net of refunds received)	$ 100	$ 0