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Consolidated Statement Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statement Of Operations [Abstract]      
Oil and Gas Revenue $ 330,422 $ 128,927 $ 37,755
Expenses      
Lease operating expenses 34,072 14,582 8,691
Production taxes 33,865 13,768 3,810
Depreciation, depletion and amortization 74,981 37,832 16,670
Exploration expenses 1,685 297 1,019
Rig termination    [1]    [1] 3,000 [1]
Impairment of oil and gas properties 3,610 11,967 6,233
Loss (gain) on sale of properties 207   (1,455)
Stock-based compensation expenses   8,743   
General and administrative expenses 29,435 19,745 9,342
Total expenses 177,855 106,934 47,310
Operating income (loss) 152,567 21,993 (9,555)
Other income (expense)      
Net gain (loss) on derivative instruments 1,595 (7,653) (4,747)
Interest expense (29,618) (1,357) (912)
Other income (expense) 1,635 284 5
Total other income (expense) (26,388) (8,726) (5,654)
Income (loss) before income taxes 126,179 13,267 (15,209)
Income tax expense 46,789 42,962   
Net income (loss) $ 79,390 $ (29,695) $ (15,209)
Earnings (loss) per share:      
Basic and diluted (Note 12) $ 0.86 $ (0.61)   
Weighted average shares outstanding:      
Basic (Note 12) 92,056 [2] 48,395 [2]   
Diluted (Note 12) 92,241 48,395   
[1] During the first quarter of 2009, we paid a total of $3.0 million in rig termination expenses in connection with early termination of two drilling rig contracts entered into in 2008. We did not have any rig termination expenses during the years ended December 31, 2011 and 2010.
[2] The basic weighted average shares outstanding calculation is based on the actual days in which the shares were outstanding for the period from June 22, 2010, the closing date of the Company's IPO, to December 31, 2010.