Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues
Oil and natural gas revenues	$ 99,054	$ 58,179	$ 177,986	$ 117,498
Realized (loss) gain on derivatives	(2,913)	254	(4,756)	646
Unrealized (loss) gain on derivatives	(5,234)	7,526	(8,342)	2,701
Total revenues	90,907	65,959	164,888	120,845
Expenses
Production taxes and marketing	9,116	4,451	15,122	8,548
Lease operating	11,704	10,140	21,055	21,040
Depletion, depreciation and amortization	31,797	20,234	55,827	48,466
Accretion of asset retirement obligations	123	80	241	161
Full-cost ceiling impairment	0	0	0	21,229
General and administrative	8,100	4,149	15,319	8,751
Total expenses	60,840	39,054	107,564	108,195
Operating income	30,067	26,905	57,324	12,650
Other income (expense)
Net loss on asset sales and inventory impairment	0	(192)	0	(192)
Interest expense	(1,616)	(1,609)	(3,012)	(2,880)
Interest and other income	409	47	447	115
Total other expense	(1,207)	(1,754)	(2,565)	(2,957)
Income before income taxes	28,860	25,151	54,759	9,693
Income tax provision
Current	1,539	32	2,814	78
Deferred	9,095	0	17,356	0
Total income tax provision	10,634	32	20,170	78
Net income	$ 18,226	$ 25,119	$ 34,589	$ 9,615
Basic
Basic (usd per share)	$ 0.27	$ 0.45	$ 0.52	$ 0.17
Diluted
Diluted (usd per share)	$ 0.26	$ 0.45	$ 0.51	$ 0.17
Basic
Basic (shares)	68,531	55,839	67,108	55,729
Diluted
Diluted (shares)	69,220	55,937	67,771	55,819