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Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statement Of Operations) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Condensed Financial Statements, Captions [Line Items]    
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 (loss) 58,150 25,544
Other income (expense)    
Equity in earnings in subsidiaries     
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 benefit (9,822) 4,161
Net income (loss) 16,441 (6,847)
Parent/Issuer [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Oil and gas revenues     
Well services revenues     
Total revenues     
Expenses    
Lease operating expenses     
Well services operating expenses     
Marketing, transportation and gathering expenses     
Production taxes     
Depreciation, depletion and amortization     
Exploration expenses     
Impairment of oil and gas properties     
General and administrative expenses 2,449 1,263
Total expenses 2,449 1,263
Operating income (loss) (2,449) (1,263)
Other income (expense)    
Equity in earnings in subsidiaries 26,264 (3,170)
Net loss on derivative instruments     
Interest expense (13,414) (4,941)
Other income 177 293
Total other income (expense) 13,027 (7,818)
Income (loss) before income taxes 10,578 (9,081)
Income tax benefit 5,863 2,234
Net income (loss) 16,441 (6,847)
Combined Guarantor Subsidiaries [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Oil and gas revenues 137,906  
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 9,750 4,687
Total expenses 77,967 31,937
Operating income (loss) 60,599 26,807
Other income (expense)    
Equity in earnings in subsidiaries     
Net loss on derivative instruments (18,586) (31,666)
Interest expense (485) (257)
Other income 421 19
Total other income (expense) (18,650) (31,904)
Income (loss) before income taxes 41,949 (5,097)
Income tax benefit (15,685) 1,927
Net income (loss) 26,264 (3,170)
Intercompany Eliminations [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Oil and gas revenues     
Well services revenues     
Total revenues     
Expenses    
Lease operating expenses     
Well services operating expenses     
Marketing, transportation and gathering expenses     
Production taxes     
Depreciation, depletion and amortization     
Exploration expenses     
Impairment of oil and gas properties     
General and administrative expenses     
Total expenses     
Operating income (loss)     
Other income (expense)    
Equity in earnings in subsidiaries (26,264) 3,170
Net loss on derivative instruments     
Interest expense     
Other income     
Total other income (expense) (26,264) 3,170
Income (loss) before income taxes (26,264) 3,170
Income tax benefit     
Net income (loss) $ (26,264) $ 3,170