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SUBSEQUENT EVENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 08, 2017
Oct. 20, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Subsequent Event [Line Items]          
Proceeds from sale of oil and gas properties, net of expenses     $ 0 $ 22,839 $ 242,914
Percentage proved oil and natural gas reserves     34.00%    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | EQT Production Company | Subsequent Event          
Subsequent Event [Line Items]          
Proceeds from sale of oil and gas properties, net of expenses $ 527,000        
Upward adjustment to the purchase price 16,000        
Disposal Group, Disposed of by Sale, Not Discontinued Operations | TH Exploration III, LLC, an affiliate of Tug Hill, Inc.          
Subsequent Event [Line Items]          
Proceeds from sale of oil and gas properties, net of expenses   $ 360,000      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | TH Exploration III, LLC, an affiliate of Tug Hill, Inc. | Subsequent Event          
Subsequent Event [Line Items]          
Loss on contract termination $ 10,800