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Derivatives - Fair Value of Derivative Contracts (Details) - Successor - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value    
Derivative assets $ 9,641  
Derivative liabilities (1,031) $ (29,714)
Total net derivative contracts 8,610 (29,714)
Current assets    
Derivatives, Fair Value    
Derivative assets 7,632  
Noncurrent assets    
Derivatives, Fair Value    
Derivative assets 2,009  
Current liabilities    
Derivatives, Fair Value    
Derivative liabilities (1,031) (27,538)
Noncurrent liabilities    
Derivatives, Fair Value    
Derivative liabilities   (2,176)
Oil price swaps | Current assets    
Derivatives, Fair Value    
Derivative assets 5,417 0
Oil price swaps | Noncurrent assets    
Derivatives, Fair Value    
Derivative assets 1,739 0
Oil price swaps | Current liabilities    
Derivatives, Fair Value    
Derivative liabilities (1,031) (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 2,214 0
Natural gas price swaps | Noncurrent assets    
Derivatives, Fair Value    
Derivative assets 271 0
Natural gas price swaps | Current liabilities    
Derivatives, Fair Value    
Derivative liabilities 0 (14,143)
Natural gas price swaps | Noncurrent liabilities    
Derivatives, Fair Value    
Derivative liabilities $ 0 $ (71)