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Property, Plant and Equipment - Capitalized Costs of Unproved Properties Excluded from Amortization (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Successor        
Property, Plant and Equipment [Line Items]        
Property acquisition, cumulative $ 96,450      
Property acquisition 42,827 $ 15,610    
Exploration, cumulative 4,434      
Exploration 1,904 678    
Total costs incurred, cumulative 100,884      
Total costs incurred $ 44,731 $ 16,288    
Predecessor        
Property, Plant and Equipment [Line Items]        
Property acquisition, cumulative       $ 18,532
Property acquisition     $ 19,481  
Exploration, cumulative       399
Exploration     1,453  
Total costs incurred, cumulative       $ 18,931
Total costs incurred     $ 20,934