CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues
Crude oil		$ 70,672	$ 112,090	$ 129,840	$ 217,666
Natural gas liquids (NGLs)		5,191	8,037	10,587	17,410
Natural gas		7,260	16,302	15,831	34,505
Gain (loss) on sales of property and equipment, net		66	(51)	(25)	56,775
Other, net		427	2,983	1,910	2,870
Total revenues		83,616	139,361	158,143	329,226
Operating expenses
Lease operating		10,907	12,001	22,476	22,117
Gathering, processing and transportation		6,383	3,928	13,881	7,177
Production and ad valorem taxes		4,967	7,510	9,656	14,815
General and administrative		11,479	14,840	23,449	31,528
Exploration		4,362	3,373	10,249	12,009
Depreciation, depletion and amortization		85,416	71,437	176,206	143,624
Impairments		1,084	117,908	1,084	117,908
Total operating expenses		124,598	230,997	257,001	349,178
Operating loss		(40,982)	(91,636)	(98,858)	(19,952)
Other income (expense)
Interest expense		(23,023)	(23,229)	(45,036)	(45,763)
Derivatives		(15,495)	(42,665)	7,372	(58,327)
Other		(540)	30	(542)	31
Loss before income taxes		(80,040)	(157,500)	(137,064)	(124,011)
Income tax (expense) benefit		(89)	56,716	(230)	42,452
Net loss		(80,129)	(100,784)	(137,294)	(81,559)
Preferred stock dividends	[1]	(6,067)	(1,718)	(12,134)	(3,440)
Induced conversion of preferred stock		0	(3,368)	0	(3,368)
Net loss attributable to common shareholders		$ (86,196)	$ (105,870)	$ (149,428)	$ (88,367)
Net loss per share:
Basic (in dollars per share)		$ (1.19)	$ (1.59)	$ (2.07)	$ (1.34)
Diluted (in dollars per share)		$ (1.19)	$ (1.59)	$ (2.07)	$ (1.34)
Weighted average shares outstanding – basic		72,398	66,514	72,330	66,065
Weighted average shares outstanding – diluted		72,398	66,514	72,330	66,065

[1] Preferred stock dividends were excluded from the computation of diluted earnings per share as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.