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Condensed Consolidated Statement of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenues        
Oil and gas revenues $ 145,203 $ 67,206 $ 283,109 $ 125,950
Well services revenues 3,861   4,521  
Total revenues 149,064 67,206 287,630 125,950
Expenses        
Lease operating expenses 12,029 5,951 21,845 11,581
Well services operating expenses 1,207   1,684  
Marketing, transportation and gathering expenses 1,970 247 4,539 559
Production taxes 13,720 7,085 26,986 13,168
Depreciation, depletion and amortization 44,213 13,100 83,099 26,912
Exploration expenses   259 2,835 291
Impairment of oil and gas properties 2,203 1,536 2,571 2,917
General and administrative expenses 13,537 6,614 25,736 12,564
Total expenses 88,879 34,792 169,295 67,992
Operating income 60,185 32,414 118,335 57,958
Other income (expense)        
Net gain (loss) on derivative instruments 74,595 27,547 56,009 (4,119)
Interest expense (14,074) (6,761) (27,973) (11,959)
Other income 776 379 1,374 691
Total other income (expense) 61,297 21,165 29,410 (15,387)
Income before income taxes 121,482 53,579 147,745 42,571
Income tax expense 45,439 20,230 55,261 16,069
Net income $ 76,043 $ 33,349 $ 92,484 $ 26,502
Earnings per share:        
Basic and diluted (Note 10) $ 0.82 $ 0.36 $ 1.00 $ 0.29
Weighted average shares outstanding:        
Basic (Note 10) 92,176 92,048 92,153 92,047
Diluted (Note 10) 92,222 92,151 92,339 92,177