CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues
Crude oil		$ 220,596	$ 420,286	$ 347,407
Natural gas liquids (NGLs)		16,905	34,552	30,748
Natural gas		25,479	58,044	52,538
Gain (loss) on sales of property and equipment, net		41,335	120,769	(266)
Other, net		983	3,122	1,041
Total revenues		305,298	636,773	431,468
Operating expenses
Lease operating		42,428	48,298	35,461
Gathering, processing and transportation		23,815	18,294	12,839
Production and ad valorem taxes		16,282	27,990	22,404
General and administrative		43,328	49,005	53,998
Exploration		12,583	17,063	20,994
Depreciation, depletion and amortization		334,479	300,299	245,594
Impairments		1,397,424	791,809	132,224
Total operating expenses		1,870,339	1,252,758	523,514
Operating loss		(1,565,041)	(615,985)	(92,046)
Other income (expense)
Interest expense		(90,951)	(88,831)	(78,841)
Loss on extinguishment of debt		0	0	(29,174)
Derivatives		71,247	162,212	(20,852)
Other		(3,587)	1,334	147
Loss before income taxes		(1,588,332)	(541,270)	(220,766)
Income tax benefit		5,371	131,678	77,696
Net loss		(1,582,961)	(409,592)	(143,070)
Preferred stock dividends	[1]	(22,789)	(17,148)	(6,900)
Induced conversion of preferred stock		0	(4,256)	0
Net loss attributable to common shareholders		$ (1,605,750)	$ (430,996)	$ (149,970)
Net loss per share:
Basic (in dollars per share)		$ (21.81)	$ (6.26)	$ (2.41)
Diluted (in dollars per share)		$ (21.81)	$ (6.26)	$ (2.41)
Weighted average shares outstanding – basic		73,639	68,887	62,335
Weighted average shares outstanding – diluted		73,639	68,887	62,335

[1] Preferred stock dividends were excluded from diluted earnings per share for the years ended December 31, 2015, 2014 and 2013, as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.