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Condensed Consolidated Statement of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Revenues        
Oil and gas revenues $ 178,748 $ 87,596 $ 461,857 $ 213,546
Well services revenues 5,963   10,484  
Total revenues 184,711 87,596 472,341 213,546
Expenses        
Lease operating expenses 16,134 9,597 37,979 21,178
Well services operating expenses 5,420   7,104  
Marketing, transportation and gathering expenses 2,744 238 7,283 797
Production taxes 16,433 8,873 43,419 22,041
Depreciation, depletion and amortization 57,684 20,859 140,783 47,771
Exploration expenses 336 54 3,171 345
Impairment of oil and gas properties 36 396 2,607 3,313
General and administrative expenses 13,886 7,306 39,622 19,870
Total expenses 112,673 47,323 281,968 115,315
Operating income 72,038 40,273 190,373 98,231
Other income (expense)        
Net gain (loss) on derivative instruments (22,441) 71,224 33,568 67,105
Interest expense (20,979) (6,786) (48,952) (18,745)
Other income 1,147 524 2,521 1,215
Total other income (expense) (42,273) 64,962 (12,863) 49,575
Income before income taxes 29,765 105,235 177,510 147,806
Income tax expense 11,451 38,946 66,712 55,015
Net income $ 18,314 $ 66,289 $ 110,798 $ 92,791
Earnings per share:        
Basic and diluted (Note 11) $ 0.20 $ 0.72 $ 1.20 $ 1.01
Weighted average shares outstanding:        
Basic (Note 11) 92,186 92,060 92,164 92,052
Diluted (Note 11) 92,416 92,164 92,343 92,208