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DIVESTITURE (Tables)
 12 Months Ended
Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]  
Schedule of Net Gain Recognized in Sale
The gain on the sale of the Appalachia Properties is computed as follows (in thousands):
Net consideration received for sale of Appalachia Properties
 
$
522,472

Add:
Release of funds held in suspense
 
4,139

 
Transfer of asset retirement obligations
 
8,672

 
Other adjustments, net
 
2,597

Less:
Transaction costs
 
(7,087
)
 
Carrying value of properties sold
 
(317,340
)
Gain on sale
 
$
213,453