Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues
Oil and natural gas revenues	$ 78,931	$ 59,319
Realized gain on derivatives	(1,843)	392
Unrealized loss on derivatives	(3,108)	(4,825)
Total revenues	73,980	54,886
Expenses
Production taxes and marketing	6,006	4,097
Lease operating	9,351	10,899
Depletion, depreciation and amortization	24,030	28,232
Accretion of asset retirement obligations	117	81
Full-cost ceiling impairment	0	21,230
General and administrative	7,219	4,602
Total expenses	46,723	69,141
Operating (loss) income	27,257	(14,255)
Other income (expense)
Interest expense	(1,396)	(1,271)
Interest and other income	38	67
Total other expense	(1,358)	(1,204)
Income (loss) before income taxes	25,899	(15,459)
Income tax provision
Current	1,275	46
Deferred	8,261
Total income tax provision	9,536	46
Net income (loss)	$ 16,363	$ (15,505)
Basic
Basic (usd per share)	$ 0.25	$ (0.28)
Diluted
Diluted (usd per share)	$ 0.25	$ (0.28)
Diluted
Diluted (shares)	66,229	55,272
Class A
Basic
Basic (shares)	65,684	55,272