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Condensed Consolidated Statement of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Revenues    
Oil and gas revenues $ 331,847 $ 241,651
Well services and midstream revenues 17,672 6,653
Total revenues 349,519 248,304
Expenses    
Lease operating expenses 39,989 19,489
Well services and midstream operating expenses 10,920 2,914
Marketing, transportation and gathering expenses 5,186 3,389
Production taxes 31,803 22,089
Depreciation, depletion and amortization 91,272 66,261
Exploration expenses 380 1,857
Impairment of oil and gas properties 762 498
General and administrative expenses 23,520 13,854
Total expenses 203,832 130,351
Gain on sale of properties 183,393 0
Operating income (loss) 329,080 117,953
Other income (expense)    
Net loss on derivative instruments (17,603) (14,612)
Interest expense, net of capitalized interest (40,158) (21,183)
Other income (expense) 153 780
Total other income (expense) (57,608) (35,015)
Income before income taxes 271,472 82,938
Income tax expense 101,519 31,087
Net income $ 169,953 $ 51,851
Earnings per share:    
Basic (in dollars per share) $ 1.71 $ 0.56
Diluted (in dollars per share) $ 1.70 $ 0.56
Weighted average shares outstanding:    
Basic (in shares) 99,560 92,375
Diluted (in shares) 100,049 92,651