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ASSET RETIREMENT OBLIGATIONS - Changes in Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Feb. 28, 2017
Feb. 28, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]            
Asset retirement obligations beginning balance         $ 290,100  
Liabilities settled         (53,100)  
Accretion expense     $ 8,095   19,698  
Revision of estimates         11,000  
Asset retirement obligations ending balance $ 290,100 $ 290,100 $ 267,600   267,600  
Predecessor            
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]            
Asset retirement obligations beginning balance   242,000     $ 235,200  
Liabilities settled   (3,600)        
Divestment of properties   (8,700)        
Accretion expense   5,447   $ 10,082   $ 30,147
Fair value fresh start adjustment 54,900          
Asset retirement obligations ending balance $ 235,200 $ 235,200