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Consolidated Statement of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues                      
Oil and gas revenues                 $ 670,491 $ 330,422 $ 128,927
Well services revenues                 16,177    
Total revenues 214,327 184,710 149,063 138,566 116,876 87,596 67,206 58,744 686,668 330,422 128,927
Expenses                      
Lease operating expenses                 54,924 32,707 14,118
Well services operating expenses                 11,774    
Marketing, transportation and gathering expenses                 9,257 1,365 464
Production taxes                 62,965 33,865 13,768
Depreciation, depletion and amortization                 206,734 74,981 37,832
Exploration expenses                 3,250 1,685 297
Impairment of oil and gas properties                 3,581 3,610 11,967
Loss on sale of properties                   207  
Stock-based compensation expenses                     8,743
General and administrative expenses                 57,190 29,435 19,745
Total expenses                 409,675 177,855 106,934
Operating income (loss) 86,619 72,038 60,184 58,152 54,336 40,273 32,414 25,544 276,993 152,567 21,993
Other income (expense)                      
Net gain (loss) on derivative instruments                 34,164 1,595 (7,653)
Interest expense                 (70,143) (29,618) (1,357)
Other income (expense)                 4,860 1,635 284
Total other income (expense)                 (31,119) (26,388) (8,726)
Income before income taxes                 245,874 126,179 13,267
Income tax expense                 92,486 46,789 42,962
Net income (loss) $ 42,591 $ 18,314 $ 76,041 $ 16,442 $ (13,401) $ 66,289 $ 33,349 $ (6,847) $ 153,388 $ 79,390 $ (29,695)
Earnings (loss) per share:                      
Basic and diluted                 $ 1.66 [1] $ 0.86 [1] $ (0.31) [1]
Weighted average shares outstanding:                      
Basic                 92,180 [1] 92,056 [1] 92,000 [1]
Diluted                 92,513 [1] 92,241 [1] 92,000 [1]
[1] 2010 restated (see Note 11).