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Fair Value Measurements - Reconciliation of Financial Liabilities Measured at Fair Value on Recurring Basis using Unobservable Inputs (Details) (Guarantees, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Guarantees
   
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 9,480 $ 0
Issuances(1) 0 [1] 9,446 [1]
Loss on guarantees 2,548 2,582
Ending balance $ 12,028 $ 12,028
[1] Represents the fair value of the guarantees of certain plugging and abandonment obligations on behalf of Fieldwood as of February 25, 2014, the closing date for the sale of the Gulf Properties.