CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues
Natural gas	$ 10,303	$ 38,300	$ 25,189	$ 79,489
Crude oil	58,382	21,548	117,105	38,131
Natural gas liquids (NGLs)	7,556	13,161	16,627	23,082
Gain on sales of property and equipment, net	78	(28)	834	452
Other	526	637	1,501	1,047
Total revenues	76,845	73,618	161,256	142,201
Operating expenses
Lease operating	9,264	10,787	18,407	21,064
Gathering, processing and transportation	4,391	4,281	8,545	8,309
Production and ad valorem taxes	(254)	2,834	3,326	7,898
General and administrative	11,747	12,954	23,888	26,306
Exploration	9,384	19,368	17,382	48,916
Depreciation, depletion and amortization	51,740	33,036	102,557	67,879
Impairments	28,616	71,071	28,616	71,071
Total operating expenses	114,888	154,331	202,721	251,443
Operating loss	(38,043)	(80,713)	(41,465)	(109,242)
Other income (expense)
Interest expense	(15,084)	(14,143)	(29,858)	(27,627)
Loss on extinguishment of debt	0	(24,238)	0	(24,238)
Derivatives	43,826	7,001	43,521	8,329
Other	28	129	29	273
Loss before income taxes	(9,273)	(111,964)	(27,773)	(152,505)
Income tax benefit	3,635	40,046	10,236	54,247
Net loss	$ (5,638)	$ (71,918)	$ (17,537)	$ (98,258)
Loss per share:
Basic	$ (0.12)	$ (1.57)	$ (0.38)	$ (2.15)
Diluted	$ (0.12)	$ (1.57)	$ (0.38)	$ (2.15)
Weighted average shares outstanding, basic	46,030	45,768	45,988	45,724
Weighted average shares outstanding, diluted	46,030	45,768	45,988	45,724