Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues
Oil and natural gas revenues	$ 59,319	$ 29,164
Realized gain on derivatives	392	3,063
Unrealized loss on derivatives	(4,825)	(3,270)
Total revenues	54,886	28,957
Expenses
Production taxes and marketing	4,097	2,165
Lease operating	10,899	4,645
Depletion, depreciation and amortization	28,232	11,205
Accretion of asset retirement obligations	81	53
Full-cost ceiling impairment	21,230
General and administrative	4,602	3,789
Total expenses	69,141	21,857
Operating (loss) income	(14,255)	7,100
Other income (expense)
Interest expense	(1,271)	(308)
Interest and other income	67	73
Total other expense	(1,204)	(235)
(Loss) income before income taxes	(15,459)	6,865
Income tax provision
Current	46
Deferred		3,064
Total income tax provision	46	3,064
Net (loss) income	$ (15,505)	$ 3,801
Basic
Basic	55,272	50,016
Diluted
Diluted	55,272	50,085
Class A
Basic
Basic	$ (0.28)	$ 0.08
Diluted
Diluted	$ (0.28)	$ 0.08
Basic
Basic	55,272	49,597
Diluted
Diluted	55,272	49,666
Class B
Basic
Basic		$ 0.15
Diluted
Diluted		$ 0.15
Basic
Basic		419
Diluted
Diluted		419