Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Crude oil, natural gas and NGL sales	$ 74,109	$ 120,013
Sales from natural gas marketing	3,233	26,937
Commodity price risk management gain (loss), net	66,662	(24,909)
Well operations, pipeline income and other	628	616
Total revenues	144,632	122,657
Costs, expenses and other:
Production costs	24,169	18,083
Cost of natural gas marketing	3,258	26,870
Exploration expense	285	307
Impairment of crude oil and natural gas properties	2,484	910
General and administrative expense	18,680	22,484
Depreciation, depletion and amortization	55,820	42,889
Accretion of asset retirement obligations	1,560	841
(Gain) loss on sale of properties and equipment	(21)	579
Total cost, expenses and other	106,235	112,963
Income from operations	38,397	9,694
Interest expense	(11,725)	(12,183)
Interest income	1,113	187
Income (loss) from continuing operations before income taxes	27,785	(2,302)
Provision for income taxes	(10,723)	894
Income (loss) from continuing operations	17,062	(1,408)
Loss from discontinued operations, net of tax	0	(719)
Net income (loss)	$ 17,062	$ (2,127)
Basic
Income (loss) from continuing operations	$ 0.47	$ (0.04)
Loss from discontinued operations, net of tax	$ 0.00	$ (0.02)
Net income (loss)	$ 0.47	$ (0.06)
Diluted
Income (loss) from continuing operations	$ 0.46	$ (0.04)
Loss from discontinued operations, net of tax	$ 0.00	$ (0.02)
Net income (loss)	$ 0.46	$ (0.06)
Weighted-average common shares outstanding
Basic	36,349	35,690
Diluted	36,981	35,690