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SUBSEQUENT EVENTS (Details) - USD ($)
Jul. 25, 2018
Jul. 31, 2018
Jun. 30, 2018
Nov. 30, 2017
Senior Notes | Senior Secured Second Lien Notes due 2025        
Subsequent Event [Line Items]        
Stated interest rate (as a percent)     11.00% 11.00%
Subsequent Event        
Subsequent Event [Line Items]        
Aggregate amount of program expansion   $ 50,000,000    
Aggregate authorized amount   100,000,000    
Repurchase program available capacity   74,383,000    
Subsequent Event | Consol Coal Resources LP Units        
Subsequent Event [Line Items]        
Aggregate amount of program expansion   $ 25,000,000    
Subsequent Event | Senior Notes | Senior Secured Second Lien Notes due 2025        
Subsequent Event [Line Items]        
Stated interest rate (as a percent)   11.00%    
Subsequent Event | CONSOL Coal Resources LP        
Subsequent Event [Line Items]        
Cash distribution declared (per common unit) $ 0.5125