CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Oil sales	$ 117,573	$ 196,005
Gas sales	82,608	110,962
NGL sales	33,352	45,600
Gas gathering and other	7,241	8,270
Gas marketing, net	(174)	165
Total revenues	240,600	361,002
Costs and expenses:
Impairment of oil and gas properties	230,132	603,599
Depreciation, depletion and amortization	128,099	216,778
Asset retirement obligation	2,298	1,736
Production	70,702	82,211
Transportation, processing and other operating	46,443	39,642
Gas gathering and other	8,080	8,864
Taxes other than income	13,839	21,981
General and administrative	13,897	15,938
Stock compensation	5,528	5,155
(Gain) loss on derivative instruments, net	(428)
Other operating, net	90	524
Total costs and expenses	518,680	996,428
Operating income (loss)	(278,080)	(635,426)
Other (income) and expense:
Interest expense	20,805	21,256
Capitalized interest	(4,904)	(9,417)
Other, net	(1,650)	(3,585)
Income (loss) before income tax	(292,331)	(643,680)
Income tax expense (benefit)	(106,200)	(228,739)
Net income (loss)	$ (186,131)	$ (414,941)
Earnings (loss) per share to common stockholders:
Basic (in dollars per share)	$ (2.00)	$ (4.84)
Diluted (in dollars per share)	(2.00)	(4.84)
Dividends per share	$ 0.08	$ 0.16
Comprehensive income (loss):
Net income (loss)	$ (186,131)	$ (414,941)
Other comprehensive income (loss):
Change in fair value of investments, net of tax	85	101
Total comprehensive income (loss)	$ (186,046)	$ (414,840)