Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues
Oil and natural gas revenues	$ 278,340	$ 367,712	$ 269,030
Realized gain (loss) on derivatives	77,094	5,022	(909)
Unrealized (loss) gain on derivatives	(39,265)	58,302	(7,232)
Total revenues	316,169	431,036	260,889
Expenses
Production taxes and marketing	35,535	33,172	20,973
Lease operating	58,193	51,353	38,720
Depletion, depreciation and amortization	178,847	134,737	98,395
Accretion of asset retirement obligations	734	504	348
Full-cost ceiling impairment	801,166	0	21,229
General and administrative	50,105	32,152	20,779
Total expenses	1,124,580	251,918	200,444
Operating (loss) income	(808,411)	179,118	60,445
Other income (expense)
Net loss on asset sales and inventory impairment	908	0	(192)
Interest expense	(21,754)	(5,334)	(5,687)
Interest and other income	2,365	1,345	225
Total other expense	(18,481)	(3,989)	(5,654)
(Loss) income before income taxes	(826,892)	175,129	54,791
Income tax provision (benefit)
Current	2,959	133	404
Deferred	(150,327)	64,242	9,293
Total income tax (benefit) provision	(147,368)	64,375	9,697
Net (loss) income	(679,524)	110,754	45,094
Net (income) loss attributable to non-controlling interest in subsidiaries	(261)	17	0
Net (loss) income	$ (679,785)	$ 110,771	$ 45,094
Earnings (loss) per common share
Basic (usd per share)	$ (8.34)	$ 1.58	$ 0.77
Diluted (usd per share)	$ (8.34)	$ 1.56	$ 0.77
Weighted average common shares outstanding
Basic	81,537	70,229	58,777
Diluted	81,537	70,906	58,929