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Derivatives - Fair Value of Derivative Contracts (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value    
Derivative assets $ 9,833  
Derivative liabilities (4,725) $ (29,714)
Total net derivative contracts 5,108 (29,714)
Current assets    
Derivatives, Fair Value    
Derivative assets 4,392  
Noncurrent assets    
Derivatives, Fair Value    
Derivative assets 5,441  
Current liabilities    
Derivatives, Fair Value    
Derivative liabilities (4,725) (27,538)
Noncurrent liabilities    
Derivatives, Fair Value    
Derivative liabilities   (2,176)
Oil price swaps | Current assets    
Derivatives, Fair Value    
Derivative assets 4,392 0
Oil price swaps | Noncurrent assets    
Derivatives, Fair Value    
Derivative assets 4,792 0
Oil price swaps | Current liabilities    
Derivatives, Fair Value    
Derivative liabilities (1,613) (13,395)
Oil price swaps | Noncurrent liabilities    
Derivatives, Fair Value    
Derivative liabilities 0 (2,105)
Natural gas price swaps | Noncurrent assets    
Derivatives, Fair Value    
Derivative assets 649 0
Natural gas price swaps | Current liabilities    
Derivatives, Fair Value    
Derivative liabilities (3,112) (14,143)
Natural gas price swaps | Noncurrent liabilities    
Derivatives, Fair Value    
Derivative liabilities $ 0 $ (71)