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STOCK, UNIT AND DEBT REPURCHASE (Details) - USD ($)
9 Months Ended
Sep. 30, 2018
Jul. 31, 2018
Dec. 31, 2017
Nov. 30, 2017
Class of Stock [Line Items]        
Aggregate authorized amount     $ 50,000,000  
Stock and debt repurchase authorized amount   $ 100,000,000    
Shares repurchased (in shares) 281,272      
Average share price (in dollars per share) $ 40.03      
Senior Secured Second Lien Notes due 2025        
Class of Stock [Line Items]        
Repayments of debt $ 20,524,000      
Senior Notes | Senior Secured Notes due 2025        
Class of Stock [Line Items]        
Stated interest rate (as a percent)   11.00% 11.00%  
Senior Notes | Senior Secured Second Lien Notes due 2025        
Class of Stock [Line Items]        
Stated interest rate (as a percent) 11.00%     11.00%
Repayments of debt $ 20,524,000      
Consol Coal Resources LP Units        
Class of Stock [Line Items]        
Stock and debt repurchase additional amount authorized   $ 25,000,000    
Shares repurchased (in shares) 77,536      
Average share price (in dollars per share) $ 17.86