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Derivatives - Fair Value of Derivative Contracts (Details) - Successor - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Assets $ 5,582,000  
Derivative liabilities (18,467,000) $ (29,714,000)
Total net derivative contracts (12,885,000) (29,714,000)
Derivative contracts - current    
Derivatives, Fair Value [Line Items]    
Assets 5,582,000  
Derivative contracts - noncurrent    
Derivatives, Fair Value [Line Items]    
Assets 0  
Derivative contracts - current    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (14,899,000) (27,538,000)
Derivative contracts - noncurrent    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (3,568,000) (2,176,000)
Oil price swaps | Derivative contracts - current    
Derivatives, Fair Value [Line Items]    
Assets 0 0
Oil price swaps | Derivative contracts - noncurrent    
Derivatives, Fair Value [Line Items]    
Assets 0 0
Oil price swaps | Derivative contracts - current    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (14,899,000) (13,395,000)
Oil price swaps | Derivative contracts - noncurrent    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (3,568,000) (2,105,000)
Natural gas price swaps | Derivative contracts - current    
Derivatives, Fair Value [Line Items]    
Assets 5,582,000 0
Natural gas price swaps | Derivative contracts - noncurrent    
Derivatives, Fair Value [Line Items]    
Assets 0 0
Natural gas price swaps | Derivative contracts - current    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 0 (14,143,000)
Natural gas price swaps | Derivative contracts - noncurrent    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ 0 $ (71,000)