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Derivatives - Fair Value of Derivative Contracts (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative assets $ 85,524 $ 338,417
Derivative liabilities (1,748) 0
Total net derivative contracts 51,480 338,417
Current assets    
Derivatives, Fair Value [Line Items]    
Derivative assets 85,524 291,414
Noncurrent assets    
Derivatives, Fair Value [Line Items]    
Derivative assets 0 47,003
Current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (1,748) 0
Oil price swaps | Current assets    
Derivatives, Fair Value [Line Items]    
Derivative assets 68,224 204,072
Oil price swaps | Noncurrent assets    
Derivatives, Fair Value [Line Items]    
Derivative assets 0 36,288
Natural gas price swaps | Current assets    
Derivatives, Fair Value [Line Items]    
Derivative assets 0 29,648
Natural gas basis swaps | Current assets    
Derivatives, Fair Value [Line Items]    
Derivative assets 0 350
Natural gas basis swaps | Current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (1,748) 0
Oil collars—three way | Current assets    
Derivatives, Fair Value [Line Items]    
Derivative assets 17,300 56,289
Oil collars—three way | Noncurrent assets    
Derivatives, Fair Value [Line Items]    
Derivative assets 0 10,715
Natural gas collars | Current assets    
Derivatives, Fair Value [Line Items]    
Derivative assets 0 1,055
Long-term debt holder conversion feature | Long-term debt    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (29,355) 0
Mandatory prepayment feature - PGC Senior Secured Notes | Long-term debt    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ (2,941) $ 0