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Derivatives - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
institution
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
institution
Jun. 30, 2016
USD ($)
Derivative Instruments and Hedging Activities Disclosure        
Number of counterparties to open derivative contracts | institution 7   7  
Successor        
Derivative Instruments and Hedging Activities Disclosure        
(Gain) loss on derivative contracts $ (23,543)   $ (57,726)  
Cash receipts, upon settlement of derivative contract     2,706  
Successor | Commodity Derivatives        
Derivative Instruments and Hedging Activities Disclosure        
(Gain) loss on derivative contracts (23,500)   (57,700)  
Cash receipts, upon settlement of derivative contract $ 3,300   $ 2,700  
Predecessor        
Derivative Instruments and Hedging Activities Disclosure        
(Gain) loss on derivative contracts   $ 7,969   $ 5,161
Cash receipts, upon settlement of derivative contract       57,970
Predecessor | Commodity Derivatives        
Derivative Instruments and Hedging Activities Disclosure        
(Gain) loss on derivative contracts   8,000   5,200
Cash receipts, upon settlement of derivative contract   32,400   58,000
Cash receipts, upon early settlement of derivative contract   $ 11,500   $ 11,513