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Consolidating Financial Statements (Schedule Of Consolidating Statement Of Operations) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Condensed Financial Statements, Captions [Line Items]                      
Oil and gas revenues                 $ 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
Impairment of oil and gas properties                 3,610 11,967 6,233
Stock-based compensation expenses                   8,743   
Loss on sale of properties                 207   (1,455)
General and administrative expenses                 29,435 19,745 9,342
Total expenses                 177,855 106,934 47,310
Operating income (loss) 54,336 40,273 32,414 25,544 12,993 10,831 648 (2,479) 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 benefit (expense)                 (46,789) (42,962)   
Net income (loss)                 79,390 (29,695) (15,209)
Parent/Issuer [Member]
                      
Expenses                      
General and administrative expenses                 5,505 2,780  
Total expenses                 5,505 2,780  
Operating income (loss)                 (5,505) (2,780)  
Other income (expense)                      
Equity in earnings of subsidiaries                 99,836 (28,124)  
Interest expense                 (28,310)    
Other income (expense)                 1,165 255  
Total other income (expense)                 72,691 (27,869)  
Income (loss) before income taxes                 67,186 (30,649)  
Income tax benefit (expense)                 12,204 954  
Net income (loss)                 79,390 (29,695)  
Combined Guarantor Subsidiaries [Member]
                      
Condensed Financial Statements, Captions [Line Items]                      
Oil and gas revenues                 330,422 128,927  
Expenses                      
Lease operating expenses                 34,072 14,582  
Production taxes                 33,865 13,768  
Depreciation, depletion and amortization                 74,981 37,832  
Exploration expenses                 1,685 297  
Impairment of oil and gas properties                 3,610 11,967  
Stock-based compensation expenses                   8,743  
Loss on sale of properties                 207    
General and administrative expenses                 23,930 16,965  
Total expenses                 172,350 104,154  
Operating income (loss)                 158,072 24,773  
Other income (expense)                      
Net gain (loss) on derivative instruments                 1,595 (7,653)  
Interest expense                 (1,308) (1,357)  
Other income (expense)                 470 29  
Total other income (expense)                 757 (8,981)  
Income (loss) before income taxes                 158,829 15,792  
Income tax benefit (expense)                 (58,993) (43,916)  
Net income (loss)                 99,836 (28,124)  
Intercompany Eliminations [Member]
                      
Other income (expense)                      
Equity in earnings of subsidiaries                 (99,836) 28,124  
Total other income (expense)                 (99,836) 28,124  
Income (loss) before income taxes                 (99,836) 28,124  
Net income (loss)                 $ (99,836) $ 28,124