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Supplemental Information on Oil and Natural Gas Producing Activities (Unaudited) - Estimate of Changes in Standardized Measure of Discounted Future Net Cash Flows from Proved Reserves (Unaudited) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Oct. 01, 2016
Dec. 31, 2018
Dec. 31, 2017
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]        
Beginning present value     $ 749,294 $ 438,364
Changes during the year        
Ending present value(2) $ 438,364   1,045,603 749,294
Successor        
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]        
Beginning present value 392,604   749,294 438,364
Changes during the year        
Adoption of ASU 2015-02 0   0 0
Revenues less production (70,668)   (236,553) (239,838)
Net changes in prices, production and other costs 35,684   316,095 347,458
Development costs incurred 7,941   80,050 35,517
Net changes in future development costs (291,232)   (11,483) (64,484)
Extensions and discoveries 14,986   102,961 112,556
Revisions of previous quantity estimates 308,374   (91,038) 26,697
Accretion of discount 9,375   70,576 37,226
Net change in income taxes 0   56 23
Purchases of reserves in-place 0   35,713 454
Sales of reserves in-place 0   (2,029) (2,977)
Timing differences and other 31,300   31,961 58,298
Net change for the year 45,760   296,309 310,930
Ending present value(2) 438,364 $ 392,604 $ 1,045,603 $ 749,294
Predecessor        
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]        
Beginning present value $ 392,604 1,314,562    
Changes during the year        
Adoption of ASU 2015-02   (224,965)    
Revenues less production   (144,256)    
Net changes in prices, production and other costs   (394,173)    
Development costs incurred   69,080    
Net changes in future development costs   436,041    
Extensions and discoveries   12,449    
Revisions of previous quantity estimates   (728,254)    
Accretion of discount   91,337    
Net change in income taxes   402    
Purchases of reserves in-place   0    
Sales of reserves in-place   (13,314)    
Timing differences and other   (26,305)    
Net change for the year   (921,958)    
Ending present value(2)   $ 392,604