CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues
Crude oil	$ 105,576	$ 63,058
Natural gas liquids (NGLs)	9,373	7,127
Natural gas	18,203	12,039
Gain (loss) on sales of property and equipment, net	56,826	(549)
Other, net	(113)	1,523
Total revenues	189,865	83,198
Operating expenses
Lease operating	10,404	7,805
Gathering, processing and transportation	2,961	3,579
Production and ad valorem taxes	7,305	5,959
General and administrative	16,688	10,943
Exploration	8,636	6,295
Depreciation, depletion and amortization	72,187	51,576
Total operating expenses	118,181	86,157
Operating income (loss)	71,684	(2,959)
Other income (expense)
Interest expense	(22,534)	(14,479)
Derivatives	(15,662)	(7,761)
Other	1	27
Income (loss) before income taxes	33,489	(25,172)
Income tax (expense) benefit	(14,264)	8,789
Net income (loss)	19,225	(16,383)
Preferred stock dividends	(1,722)	(1,725)
Net income (loss) attributable to common shareholders - Diluted	$ 17,503	$ (18,108)
Net income (loss) per share:
Basic (in dollars per share)	$ 0.27	$ (0.33)
Diluted (in dollars per share)	$ 0.22	$ (0.33)
Weighted average shares outstanding - basic	65,611	55,341
Weighted average shares outstanding - diluted	85,744	55,341