Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues and other income
Natural gas, NGL and oil sales	$ 271,799	$ 187,757	$ 755,367	$ 548,583
Transportation and gathering	816	(1,640)	88	1,104
Derivative fair value income	65,762	9,981	77,967	58,860
Gain (loss) on the sale of assets	203	67	(1,280)	78,156
Other	(375)	(1,010)	268	(1,948)
Total revenues and other income	338,205	195,155	832,410	684,755
Costs and expenses
Direct operating	29,828	25,535	87,054	68,542
Production and ad valorem taxes	7,317	6,903	21,746	19,108
Exploration	17,606	15,225	56,385	43,784
Abandonment and impairment of unproved properties	16,627	14,435	52,064	30,713
General and administrative	35,907	36,523	108,986	100,529
Termination costs				7,938
Deferred compensation plan	8,717	(5,347)	33,569	(25,194)
Interest expense	34,181	23,363	90,343	65,565
Loss on early extinguishment of debt	(4)	5,351	18,576	5,351
Depletion, depreciation and amortization	93,619	69,730	244,129	202,350
Impairment of proved properties	38,681		38,681	6,505
Total costs and expenses	282,479	191,718	751,533	525,191
Income from continuing operations before income taxes	55,726	3,437	80,877	159,564
Income tax expense (benefit)
Current	(7)	(10)	1	(10)
Deferred	22,547	794	35,345	61,569
Total income tax expense	22,540	784	35,346	61,559
Income from continuing operations	33,186	2,653	45,531	98,005
Discontinued operations, net of taxes	1,569	(10,821)	15,484	(19,542)
Net income (loss)	$ 34,755	$ (8,168)	$ 61,015	$ 78,463
Income (loss) per common share
Basic-income from continuing operations	$ 0.21	$ 0.02	$ 0.28	$ 0.61
-discontinued operations	$ 0.01	$ (0.07)	$ 0.10	$ (0.12)
-net income (loss)	$ 0.22	$ (0.05)	$ 0.38	$ 0.49
Diluted-income from continuing operations	$ 0.20	$ 0.02	$ 0.28	$ 0.61
-discontinued operations	$ 0.01	$ (0.07)	$ 0.10	$ (0.12)
-net income (loss)	$ 0.21	$ (0.05)	$ 0.38	$ 0.49
Dividends per common share	$ 0.04	$ 0.04	$ 0.12	$ 0.12
Weighted average common shares outstanding
Basic	158,154	157,109	157,901	156,777
Diluted	159,322	158,184	158,939	158,493