Consolidated Statement of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues:
Natural gas sales	$ 695,733	$ 982,413	$ 886,396
Oil sales	114,241	119,383	92,990
Total operating revenues	809,974	1,101,796	979,386
Expenses:
Lease operating expenses	64,468	51,758	45,938
Production taxes	60,757	97,094	95,914
Gathering fees	59,004	56,511	50,126
Transportation charges	84,470	64,243	64,965
Depletion and depreciation	388,985	346,394	241,796
Ceiling test and other impairments	2,972,464	0	0
General and Administrative Expense	25,104	26,032	24,351
Total operating expenses	3,655,252	642,032	523,090
Operating income (loss)	(2,845,278)	459,764	456,296
Other income (expense), net:
Interest expense	(88,180)	(63,156)	(49,032)
Gain (loss) on commodity derivatives	73,581	313,732	325,452
Contract Cancellation Fees	(15,469)	0	0
Litigation expense	0	0	(9,902)
Other income (expense) net	(1,765)	532	260
Total other income (expense), net	(31,833)	251,108	266,778
(Loss) income before income tax (benefit) provision	(2,877,111)	710,872	723,074
Income tax (benefit) provision	(700,213)	257,670	258,615
Net (loss) income	$ (2,176,898)	$ 453,202	$ 464,459
Basic (Loss) Earnings per Share:
Net (loss) income per common share - basic	$ (14.24)	$ 2.97	$ 3.05
Fully Diluted Earnings per Share:
Net (loss) income per common share - fully diluted	$ (14.24)	$ 2.94	$ 3.01
Weighted average common shares outstanding - basic	152,845	152,754	152,346
Weighted average common shares outstanding - fully diluted	152,845	154,336	154,253