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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
1 Months Ended 5 Months Ended 6 Months Ended
Feb. 08, 2018
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Feb. 08, 2018
Asset Retirement Obligation [Line Items]              
Balance, beginning of period   $ 0 $ 11,552        
Liabilities assumed in Business Combination   5,998 0        
Liabilities incurred   877 634        
Liabilities settled   (806) (162)        
Liabilities transferred in sale of properties   (20) 0        
Revisions to estimates   665 (8)        
Accretion expense   263 470        
Balance, end of period   0 $ 11,552 $ 12,486 $ 11,552 $ 6,977 $ 0
Less: current portion       44 2,079 538  
Long-term portion       $ 12,442 $ 9,473 $ 6,439  
Predecessor              
Asset Retirement Obligation [Line Items]              
Balance, beginning of period $ 10,469 10,509          
Liabilities assumed in Business Combination 0            
Liabilities incurred 0            
Liabilities settled (63)            
Liabilities transferred in sale of properties 0            
Revisions to estimates 63            
Accretion expense 40            
Balance, end of period $ 10,469 $ 10,509         10,509
Less: current portion             33
Long-term portion             $ 10,476