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SUBSEQUENT EVENTS (Details) - USD ($)
Apr. 25, 2019
May 08, 2019
Jul. 31, 2018
Subsequent Event [Line Items]      
Stock and debt repurchase authorized amount     $ 100,000,000
Subsequent Event | CONSOL Coal Resources LP      
Subsequent Event [Line Items]      
Cash distribution declared (in dollars per share) $ 0.5125    
Stock and debt repurchase additional amount authorized   $ 75,000,000  
Stock and debt repurchase authorized amount   175,000,000  
Stock and debt repurchase restricted authorized amount   50,000,000  
Stock and debt repurchase program, available capacity   $ 110,170,000