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, natural gas and NGL sales	$ 104,483	$ 120,526	$ 275,520	$ 371,556
Sales from natural gas marketing	2,580	13,297	8,336	62,649
Commodity price risk management gain (loss), net	123,549	90,213	141,170	12,661
Well operations, pipeline income and other	488	520	1,666	1,650
Total revenues	231,100	224,556	426,692	448,516
Costs, expenses and other:
Production costs	25,484	22,754	71,129	64,611
Cost of natural gas marketing	2,781	13,347	8,875	62,645
Exploration expense	252	190	812	773
Impairment of crude oil and natural gas properties	153,535	1,863	158,792	3,621
General and administrative expense	18,528	34,625	55,875	96,549
Depreciation, depletion and amortization	80,947	49,640	206,873	142,165
Accretion of asset retirement obligations	1,594	861	4,742	2,542
(Gain) loss on sale of properties and equipment	(74)	21	(302)	577
Total cost, expenses and other	283,047	123,301	506,796	373,483
Income (loss) from operations	(51,947)	101,255	(80,104)	75,033
Interest expense	(12,092)	(11,821)	(35,384)	(36,199)
Interest income	1,378	39	3,626	309
Income (loss) from continuing operations before income taxes	(62,661)	89,473	(111,862)	39,143
Provision for income taxes	21,167	(35,396)	40,560	(15,852)
Income (loss) from continuing operations	(41,494)	54,077	(71,302)	23,291
Income (loss) from discontinued operations, net of tax	0	(80)	0	392
Net income (loss)	$ (41,494)	$ 53,997	$ (71,302)	$ 23,683
Basic
Income (loss) from continuing operations	$ (1.04)	$ 1.51	$ (1.84)	$ 0.65
Income (loss) from discontinued operations, net of tax	0.00	0.00	0.00	0.01
Net income (loss)	(1.04)	1.51	(1.84)	0.66
Diluted
Income (loss) from continuing operations	(1.04)	1.47	(1.84)	0.63
Income (loss) from discontinued operations, net of tax	0.00	0.00	0.00	0.01
Net income (loss)	$ (1.04)	$ 1.47	$ (1.84)	$ 0.64
Weighted-average common shares outstanding
Basic	40,085	35,834	38,837	35,763
Diluted	40,085	36,828	38,837	36,831