CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues
Crude oil		$ 51,124	$ 118,716	$ 180,964	$ 336,382
Natural gas liquids (NGLs)		3,254	9,790	13,841	27,200
Natural gas		6,312	13,354	22,143	47,859
Gain (loss) on sales of property and equipment, net		50,828	63,520	50,803	120,295
Other, net		466	16	2,376	2,886
Total revenues		111,984	205,396	270,127	534,622
Operating expenses
Lease operating		11,304	14,761	33,780	36,878
Gathering, processing and transportation		5,654	5,428	19,535	12,605
Production and ad valorem taxes		3,483	7,690	13,139	22,505
General and administrative		9,416	11,527	32,865	43,055
Exploration		1,673	1,986	11,922	13,995
Depreciation, depletion and amortization		76,850	71,999	253,056	215,623
Impairments		0	6,084	1,084	123,992
Total operating expenses		108,380	119,475	365,381	468,653
Operating income (loss)		3,604	85,921	(95,254)	65,969
Other income (expense)
Interest expense		(22,985)	(21,953)	(68,021)	(67,716)
Derivatives		44,701	66,457	52,073	8,130
Other		(44)	1,349	(586)	1,380
Income (loss) before income taxes		25,276	131,774	(111,788)	7,763
Income tax (expense) benefit		624	(42,113)	394	339
Net income (loss)		25,900	89,661	(111,394)	8,102
Preferred stock dividends	[1]	(5,935)	(7,641)	(18,069)	(11,081)
Less: Induced conversion of preferred stock		0	(888)	0	(4,256)
Net income (loss) attributable to common shareholders		$ 19,965	$ 81,132	$ (129,463)	$ (7,235)
Net income (loss) per share:
Basic (in dollars per share)		$ 0.27	$ 1.13	$ (1.79)	$ (0.11)
Diluted (in dollars per share)		$ 0.25	$ 0.87	$ (1.79)	$ (0.11)
Weighted average shares outstanding – basic		72,651	71,536	72,438	67,909
Weighted average shares outstanding – diluted		103,452	103,606	72,438	67,909

[1] Preferred stock dividends and payments to induce the conversion of preferred stock were excluded from the computation of diluted earnings per share for the nine months ended September 30, 2015 and 2014 as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.