CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Oil sales	$ 224,066,000	$ 117,573,000
Gas sales	131,945,000	82,608,000
NGL sales	80,426,000	33,352,000
Gas gathering and other	10,625,000	7,241,000
Gas marketing, net of related costs of $39,853 and $25,312 respectively	114,000	(174,000)
Total revenues	447,176,000	240,600,000
Costs and expenses:
Impairment of oil and gas properties	0	318,786,000
Depreciation, depletion and amortization	95,816,000	110,636,000
Asset retirement obligation	1,620,000	2,298,000
Production	62,421,000	70,702,000
Transportation, processing and other operating	55,023,000	46,443,000
Gas gathering and other	8,427,000	8,080,000
Taxes other than income	21,313,000	13,839,000
General and administrative	18,034,000	13,897,000
Stock compensation	6,288,000	5,528,000
(Gain) loss on derivative instruments, net	(43,861,000)	(428,000)
Other operating, net	616,000	90,000
Total costs and expenses	225,697,000	589,871,000
Operating income (loss)	221,479,000	(349,271,000)
Other (income) and expense:
Interest expense	21,052,000	20,805,000
Capitalized interest	(6,641,000)	(4,904,000)
Other, net	(2,210,000)	(1,650,000)
Income (loss) before income tax	209,278,000	(363,522,000)
Income tax expense (benefit)	78,306,000	(132,063,000)
Net income (loss)	$ 130,972,000	$ (231,459,000)
Earnings (loss) per share to common stockholders:
Basic (in dollars per share)	$ 1.38	$ (2.49)
Diluted (in dollars per share)	1.38	(2.49)
Dividends declared (in dollars per share)	$ 0.08	$ 0.08
Comprehensive income (loss):
Net income (loss)	$ 130,972,000	$ (231,459,000)
Other comprehensive income:
Change in fair value of investments, net of tax of $231 and $49, respectively	402,000	85,000
Total comprehensive income (loss)	$ 131,374,000	$ (231,374,000)