Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Crude oil, natural gas and NGL sales	$ 82,136	$ 52,291	$ 239,112	$ 170,588
Sales from natural gas marketing	16,946	11,178	48,695	31,172
Commodity price risk management gain (loss), net	(23,638)	(31,943)	(21,269)	18,287
Well operations, pipeline income and other	1,672	1,194	3,709	3,419
Total revenues	77,116	32,720	270,247	223,466
Costs, expenses and other:
Production costs	19,057	15,797	51,091	41,106
Cost of natural gas marketing	17,127	11,260	48,928	30,841
Exploration expense	2,030	1,773	5,156	6,019
Impairment of crude oil and natural gas properties	4,472	388	52,433	1,332
General and administrative expense	16,080	13,710	46,978	42,796
Depreciation, depletion and amortization	30,870	22,121	86,619	73,872
Accretion of asset retirement obligations	1,186	1,101	3,506	2,560
Gain on sale of properties and equipment	(712)	(1,508)	(759)	(3,908)
Total cost, expenses and other	90,110	64,642	293,952	194,618
Income (loss) from operations	(12,994)	(31,922)	(23,705)	28,848
Interest expense	(12,509)	(11,360)	(38,955)	(31,857)
Interest income	130	3	133	5
Loss from continuing operations before income taxes	(25,373)	(43,279)	(62,527)	(3,004)
Provision for income taxes	10,155	15,268	22,856	935
Loss from continuing operations	(15,218)	(28,011)	(39,671)	(2,069)
Income (loss) from discontinued operations, net of tax	(782)	(4,632)	4,171	(2,468)
Net loss	$ (16,000)	$ (32,643)	$ (35,500)	$ (4,537)
Basic
Loss from continuing operations	$ (0.46)	$ (0.93)	$ (1.26)	$ (0.08)
Income (loss) from discontinued operations	$ (0.02)	$ (0.15)	$ 0.13	$ (0.09)
Net loss	$ (0.48)	$ (1.08)	$ (1.13)	$ (0.17)
Diluted
Loss from continuing operations	$ (0.46)	$ (0.93)	$ (1.26)	$ (0.08)
Income (loss) from discontinued operations	$ (0.02)	$ (0.15)	$ 0.13	$ (0.09)
Net loss	$ (0.48)	$ (1.08)	$ (1.13)	$ (0.17)
Weighted-average common shares outstanding
Basic	33,413	30,214	31,350	26,819
Diluted	33,413	30,214	31,350	26,819