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Derivatives - Fair Value of Derivative Contracts (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value    
Derivative assets $ 25,363  
Derivative liabilities (57) $ (29,714)
Total net derivative contracts 25,306 (29,714)
Current assets    
Derivatives, Fair Value    
Derivative assets 17,885  
Noncurrent assets    
Derivatives, Fair Value    
Derivative assets 7,478  
Current liabilities    
Derivatives, Fair Value    
Derivative liabilities (57) (27,538)
Noncurrent liabilities    
Derivatives, Fair Value    
Derivative liabilities   (2,176)
Oil price swaps | Current assets    
Derivatives, Fair Value    
Derivative assets 15,642 0
Oil price swaps | Noncurrent assets    
Derivatives, Fair Value    
Derivative assets 6,011 0
Oil price swaps | Current liabilities    
Derivatives, Fair Value    
Derivative liabilities 0 (13,395)
Oil price swaps | Noncurrent liabilities    
Derivatives, Fair Value    
Derivative liabilities 0 (2,105)
Natural gas price swaps | Current assets    
Derivatives, Fair Value    
Derivative assets 2,243 0
Natural gas price swaps | Noncurrent assets    
Derivatives, Fair Value    
Derivative assets 1,467 0
Natural gas price swaps | Current liabilities    
Derivatives, Fair Value    
Derivative liabilities (57) (14,143)
Natural gas price swaps | Noncurrent liabilities    
Derivatives, Fair Value    
Derivative liabilities $ 0 $ (71)