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Derivatives - Fair Value of Derivative Contracts (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Derivatives, Fair Value    
Derivative assets $ 21,000 $ 85,524
Derivative liabilities (356) (1,748)
Total net derivative contracts 20,644 51,480
Current assets    
Derivatives, Fair Value    
Derivative assets 21,000 85,524
Current liabilities    
Derivatives, Fair Value    
Derivative liabilities (356) (1,748)
Oil price swaps | Current assets    
Derivatives, Fair Value    
Derivative assets 21,000 68,224
Oil collars - three way | Current assets    
Derivatives, Fair Value    
Derivative assets 0 17,300
Natural gas basis swaps | Current liabilities    
Derivatives, Fair Value    
Derivative liabilities (356) (1,748)
Debt holder conversion feature | Current maturities of long-term debt    
Derivatives, Fair Value    
Derivative liabilities 0 (29,355)
Mandatory prepayment feature - PGC Senior Secured Notes | Current maturities of long-term debt    
Derivatives, Fair Value    
Derivative liabilities $ 0 $ (2,941)