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ASSET RETIREMENT OBLIGATIONS (Changes in Aggregate Asset Retirement Obligation) (Details) - USD ($)
$ in Thousands
5 Months Ended 7 Months Ended 12 Months Ended
May 31, 2018
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial Designation, Predecessor and Successor [Fixed List] Predecessor Successor Successor Successor Predecessor Predecessor
Asset retirement obligation, current   $ 2,077 $ 1,302 $ 2,077    
Changes in aggregate ARO            
Balance at beginning of period $ 161,963 122,878 119,606 161,963    
Liabilities incurred 77 8 346      
Revisions     (6)      
Accretion expense 3,176 5,420 8,112   $ 7,653  
Settlements and divestitures (385) (8,700) (37,949)      
Liabilities held for sale     139      
Balance at end of period 122,878 119,606 $ 89,970 $ 119,606 $ 161,963  
Previously Reported [Member]            
Changes in aggregate ARO            
Balance at beginning of period   164,831        
Balance at end of period 164,831          
Restatement | Revaluation of Liabilities [Member]            
Changes in aggregate ARO            
Balance at beginning of period   $ (41,953)        
Balance at end of period $ (41,953)