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Consolidated Statement of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenues      
Oil and gas revenues $ 1,084,412 $ 670,491 $ 330,422
Well services and midstream revenues 57,587 16,177 0
Total revenues 1,141,999 686,668 330,422
Expenses      
Lease operating expenses 94,634 54,924 32,707
Well services and midstream operating expenses 30,713 11,774 0
Marketing, transportation and gathering expenses 25,924 9,257 1,365
Production taxes 100,537 62,965 33,865
Depreciation, depletion and amortization 307,055 206,734 74,981
Exploration expenses 2,260 3,250 1,685
Impairment of oil and gas properties 1,168 3,581 3,610
Loss on sale of properties 0 0 207
General and administrative expenses 75,310 57,190 29,435
Total expenses 637,601 409,675 177,855
Operating income 504,398 276,993 152,567
Other income (expense)      
Net gain (loss) on derivative instruments (35,432) 34,164 1,595
Interest expense, net of capitalized interest (107,165) (70,143) (29,618)
Other income (expense) 1,216 4,860 1,635
Total other income (expense) (141,381) (31,119) (26,388)
Income before income taxes 363,017 245,874 126,179
Income tax expense 135,058 92,486 46,789
Net income $ 227,959 $ 153,388 $ 79,390
Earnings per share:      
Basic (in dollars per share) $ 2.45 $ 1.66 $ 0.86
Diluted (in dollars per share) $ 2.44 $ 1.66 $ 0.86
Weighted average shares outstanding:      
Basic (in shares) 92,867 92,180 92,056
Diluted (in shares) 93,411 92,513 92,241