Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues:
Crude oil, natural gas and NGL sales	$ 120,526	$ 77,340	$ 371,556	$ 226,985
Sales from natural gas marketing	13,297	16,946	62,649	48,695
Commodity price risk management gain (loss), net	90,213	(24,138)	12,661	(22,075)
Well operations, pipeline income and other	520	1,667	1,650	3,681
Total revenues	224,556	71,815	448,516	257,286
Costs, expenses and other:
Production costs	22,754	17,036	64,611	45,691
Cost of natural gas marketing	13,347	17,127	62,645	48,928
Exploration expense	190	1,841	773	4,647
Impairment of crude oil and natural gas properties	1,863	4,236	3,621	51,794
General and administrative expense	34,625	15,052	96,549	43,938
Depreciation, depletion and amortization	49,640	26,957	142,165	77,876
Accretion of asset retirement obligations	861	1,181	2,542	3,491
(Gain) loss on sale of properties and equipment	21	(100)	577	(131)
Total cost, expenses and other	123,301	83,330	373,483	276,234
Income (loss) from operations	101,255	(11,515)	75,033	(18,948)
Interest expense	(11,821)	(11,957)	(36,199)	(37,883)
Interest income	39	130	309	133
Income (loss) from continuing operations before income taxes	89,473	(23,342)	39,143	(56,698)
Provision for income taxes	(35,396)	9,435	(15,852)	20,789
Income (loss) from continuing operations	54,077	(13,907)	23,291	(35,909)
Income (loss) from discontinued operations, net of tax	(80)	(2,093)	392	409
Net income (loss)	$ 53,997	$ (16,000)	$ 23,683	$ (35,500)
Basic
Income (loss) from continuing operations	$ 1.51	$ (0.42)	$ 0.65	$ (1.14)
Income (loss) from discontinued operations, net of tax	$ 0.00	$ (0.06)	$ 0.01	$ 0.01
Net income (loss)	$ 1.51	$ (0.48)	$ 0.66	$ (1.13)
Diluted
Income (loss) from continuing operations	$ 1.47	$ (0.42)	$ 0.63	$ (1.14)
Income (loss) from discontinued operations, net of tax	$ 0.00	$ (0.06)	$ 0.01	$ 0.01
Net income (loss)	$ 1.47	$ (0.48)	$ 0.64	$ (1.13)
Weighted-average common shares outstanding
Basic	35,834	33,413	35,763	31,350
Diluted	36,828	33,413	36,831	31,350