CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues
Natural gas	$ 14,886	$ 41,189
Crude oil	58,723	16,583
Natural gas liquids (NGLs)	9,071	9,921
Gain on sales of property and equipment, net	756	480
Other	975	410
Total revenues	84,411	68,583
Operating expenses
Lease operating	9,143	10,277
Gathering, processing and transportation	4,154	4,028
Production and ad valorem taxes	3,580	5,064
General and administrative	12,141	13,352
Exploration	7,998	29,548
Depreciation, depletion and amortization	50,817	34,843
Total operating expenses	87,833	97,112
Operating loss	(3,422)	(28,529)
Other income (expense)
Interest expense	(14,774)	(13,484)
Derivatives	(305)	1,328
Other	1	144
Loss before income taxes	(18,500)	(40,541)
Income tax benefit	6,601	14,201
Net loss	$ (11,899)	$ (26,340)
Loss per share:
Basic	$ (0.26)	$ (0.58)
Diluted	$ (0.26)	$ (0.58)
Weighted average shares outstanding, basic	45,945	45,687
Weighted average shares outstanding, diluted	45,945	45,687