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Stock, Unit and Debt Repurchase Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 31, 2018
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) 708,245 0 0    
Average share price (in dollars per share) $ 36.48        
Senior Secured Second Lien Notes due 2025 | Senior Notes          
Class of Stock [Line Items]          
Stated interest rate 11.00% 11.00%   11.00% 11.00%
Repayments of debt $ 25,724,000 $ 0      
Consol Coal Resources LP Units          
Class of Stock [Line Items]          
Stock and debt repurchase additional amount authorized       $ 25,000,000  
Shares repurchased (in shares) 167,958 0      
Average share price (in dollars per share) $ 18.33