Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	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