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Asset Retirement Obligations - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Reconciliation Of Changes In Asset Retirement Obligations [Line Items]  
Liability settled or disposed in current period $ (50,722)
Bullwinkle Platform
 
Reconciliation Of Changes In Asset Retirement Obligations [Line Items]  
Liability settled or disposed in current period (22,700)
Permian Properties
 
Reconciliation Of Changes In Asset Retirement Obligations [Line Items]  
Liability settled or disposed in current period $ (15,200)