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DIVESTITURE - Schedule of Net Gain Recognized in Sale (Details) - USD ($)
$ in Thousands
2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
Feb. 27, 2017
Feb. 28, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Transfer of asset retirement obligations         $ 32,800    
Carrying value of properties sold     $ (19,191)   (19,191)    
Gain on sale of oil and gas properties     $ 27   $ 27    
Appalachia Properties | Disposal Group, Disposed of by Sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Net consideration received for sale of Appalachia Properties $ 522,472            
Predecessor              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Transfer of asset retirement obligations   $ 3,600          
Carrying value of properties sold             $ (26,213)
Gain on sale of oil and gas properties   $ 213,453   $ 0   $ 0  
Predecessor | Appalachia Properties | Disposal Group, Disposed of by Sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Net consideration received for sale of Appalachia Properties 522,500            
Release of funds held in suspense 4,100            
Transfer of asset retirement obligations 8,700            
Other adjustments, net 2,600            
Transaction costs (7,100)            
Gain on sale of oil and gas properties 213,500            
Predecessor | Appalachia Properties | Disposal Group, Disposed of by Sale | Oil and Gas Properties              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Carrying value of properties sold $ (317,300)