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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended
Feb. 08, 2018
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Feb. 08, 2018
Asset Retirement Obligation [Line Items]              
Balance, beginning of period   $ 0 $ 11,552        
Liabilities assumed   5,998 0        
Liabilities incurred   421 313        
Liabilities settled   (166) (151)        
Revisions to estimates   300 0        
Exploration   102 229        
Balance, end of period   0 $ 11,552 $ 11,943 $ 11,552 $ 6,655 $ 0
Less: Current portion       48 2,079 622  
Long-term portion       $ 11,895 $ 9,473 $ 6,033  
Predecessor              
Asset Retirement Obligation [Line Items]              
Balance, beginning of period $ 10,469 10,508          
Liabilities assumed 0            
Liabilities settled (63)            
Revisions to estimates 63            
Exploration 39            
Balance, end of period $ 10,469 $ 10,508         10,508
Less: Current portion             33
Long-term portion             $ 10,475