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Consolidated Statement of Operations - USD ($)
shares in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues      
Oil and gas revenues $ 721,672,000 $ 1,304,004,000 $ 1,084,412,000
Well services and midstream revenues 68,063,000 86,224,000 57,587,000
Total revenues 789,735,000 1,390,228,000 1,141,999,000
Operating expenses      
Lease operating expenses 144,481,000 169,600,000 94,634,000
Well services and midstream operating expenses 28,031,000 50,252,000 30,713,000
Marketing, transportation and gathering expenses 31,610,000 29,133,000 25,924,000
Production taxes 69,584,000 127,648,000 100,537,000
Depreciation, depletion and amortization 485,322,000 412,334,000 307,055,000
Exploration expenses 2,369,000 3,064,000 2,260,000
Rig termination 3,895,000 0 0
Impairment of oil and gas properties 46,109,000 47,238,000 1,168,000
General and administrative expenses 92,498,000 92,306,000 75,310,000
Total operating expenses 903,899,000 931,575,000 637,601,000
Gain on sale of properties 0 186,999,000 0
Operating income (loss) (114,164,000) 645,652,000 504,398,000
Other income (expense)      
Net gain (loss) on derivative instruments 210,376,000 327,011,000 (35,432,000)
Interest expense, net of capitalized interest (149,648,000) (158,390,000) (107,165,000)
Other income (expense) (2,935,000) 195,000 1,216,000
Total other income (expense) 57,793,000 168,816,000 (141,381,000)
Income (loss) before income taxes (56,371,000) 814,468,000 363,017,000
Income tax benefit (expense) 16,123,000 (307,591,000) (135,058,000)
Net income (loss) $ (40,248,000) $ 506,877,000 $ 227,959,000
Earnings (loss) per share:      
Basic (in dollars per share) $ (0.31) $ 5.09 $ 2.45
Diluted (in dollars per share) $ (0.31) $ 5.05 $ 2.44
Weighted average shares outstanding:      
Basic (in shares) 130,186 99,677 92,867
Diluted (in shares) 130,186 100,365 93,411