Consolidated Statement of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues:
Natural gas sales	$ 982,413	$ 886,396	$ 601,023
Oil sales	119,383	92,990	65,739
Total operating revenues	1,101,796	979,386	666,762
Expenses:
Lease operating expenses	51,758	45,938	40,679
Production taxes	97,094	95,914	66,970
Gathering fees	56,511	50,126	45,155
Transportation charges	64,243	64,965	58,011
Depletion and depreciation	346,394	241,796	201,826
Write-down of proved oil and gas properties	0	0	1,037,000
General and Administrative Expense	26,032	24,351	19,772
Total operating expenses	642,032	523,090	1,469,413
Operating income (loss)	459,764	456,296	(802,651)
Other income (expense), net:
Interest expense	(63,156)	(49,032)	(37,167)
(Loss) gain on commodity derivatives	313,732	325,452	146,517
Litigation expense	0	(9,902)	0
Other income (expense) net	532	260	(2,888)
Total other income (expense), net	251,108	266,778	106,462
(Loss) income before income tax (benefit) provision	710,872	723,074	(696,189)
Income tax (benefit) provision	257,670	258,615	(245,136)
Net (loss) income	$ 453,202	$ 464,459	$ (451,053)
Basic (Loss) Earnings per Share:
Net (loss) income per common share - basic	$ 2.97	$ 3.05	$ (2.98)
Fully Diluted Earnings per Share:
Net (loss) income per common share - fully diluted	$ 2.94	$ 3.01	$ (2.98)
Weighted average common shares outstanding - basic	152,754	152,346	151,367
Weighted average common shares outstanding - fully diluted	154,336	154,253	151,367