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Asset Retirement Obligations - Reconciliation of Beginning and Ending Aggregate Carrying Amounts of Asset Retirement Obligations (Parenthetical) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 1 Months Ended
Jun. 30, 2014
Feb. 28, 2014
Gulf Properties
Reconciliation Of Changes In Asset Retirement Obligations    
Liability settled or disposed in current period(1) $ (377,662) [1] $ (366,000)
[1] Includes $366.0 million associated with the Gulf Properties sold in February 2014.