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DIVESTITURE - Schedule of Net Gain Recognized in Sale (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended
Feb. 27, 2017
Mar. 31, 2017
Feb. 28, 2017
Mar. 31, 2016
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Transfer of asset retirement obligations   $ 17,600      
Carrying value of properties sold   (20,741)      
Gain on sale of oil and gas properties   $ 0      
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  
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)