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Condensed Consolidated Statement Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Condensed Consolidated Statement Of Operations [Abstract]    
Oil and gas revenues $ 137,906 $ 58,744
Well services revenues 660  
Total revenues 138,566 58,744
Expenses    
Lease operating expenses 9,816 5,630
Well services operating expenses 477  
Marketing, transportation and gathering expenses 2,569 312
Production taxes 13,266 6,083
Depreciation, depletion and amortization 38,886 13,812
Exploration expenses 2,835 32
Impairment of oil and gas properties 368 1,381
General and administrative expenses 12,199 5,950
Total expenses 80,416 33,200
Operating income 58,150 25,544
Other income (expense)    
Net loss on derivative instruments (18,586) (31,666)
Interest expense (13,899) (5,198)
Other income 598 312
Total other income (expense) (31,887) (36,552)
Income (loss) before income taxes 26,263 (11,008)
Income tax (expense) benefit (9,822) 4,161
Net income (loss) $ 16,441 $ (6,847)
Earnings (loss) per share:    
Basic and diluted (Note 10) $ 0.18 $ (0.07)
Weighted average shares outstanding:    
Basic (Note 10) 92,130 92,047
Diluted (Note 10) 92,231 92,047