CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues
Natural gas	$ 11,909	$ 34,171	$ 37,098	$ 113,660
Crude oil	56,995	37,147	174,100	75,278
Natural gas liquids (NGLs)	6,671	10,676	23,298	33,758
Gain on sales of property and equipment, net	1,573	71	2,407	523
Other	551	1,288	2,052	2,335
Total revenues	77,699	83,353	238,955	225,554
Operating expenses
Lease operating	6,206	8,458	24,613	29,522
Gathering, processing and transportation	3,127	2,952	11,672	11,261
Production and ad valorem taxes	4,589	3,391	7,915	11,289
General and administrative	11,634	12,635	35,522	38,941
Exploration	9,265	19,303	26,647	68,219
Depreciation, depletion and amortization	49,331	45,345	151,888	113,224
Impairments	700	0	29,316	71,071
Loss on long-term purchase commitment	17,332	0	17,332	0
Other	0	300	0	300
Total operating expenses	102,184	92,384	304,905	343,827
Operating loss	(24,485)	(9,031)	(65,950)	(118,273)
Other income (expense)
Interest expense	(14,979)	(14,206)	(44,837)	(41,833)
Loss on extinguishment of debt	(3,144)	(1,165)	(3,144)	(25,403)
Derivatives	(12,271)	11,498	31,250	19,827
Other	60	61	89	334
Loss before income taxes	(54,819)	(12,843)	(82,592)	(165,348)
Income tax benefit	22,208	6,125	32,444	60,372
Net loss	$ (32,611)	$ (6,718)	$ (50,148)	$ (104,976)
Loss per share:
Basic	$ (0.71)	$ (0.15)	$ (1.09)	$ (2.29)
Diluted	$ (0.71)	$ (0.15)	$ (1.09)	$ (2.29)
Weighted average shares outstanding, basic	46,050	45,817	46,009	45,758
Weighted average shares outstanding, diluted	46,050	45,817	46,009	45,758