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STOCK, UNIT AND DEBT REPURCHASE (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
May 31, 2019
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    
Retirement of Common Stock (in shares) 351,443 47,000 44,000 351,443 91,000        
Stock repurchased (in shares) 6,884                
Stock repurchase price (in dollars per share)       $ 27.18 $ 36.05        
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%   11.00% 11.00%       11.00%
Repayments of debt       $ 19,320,000 $ 20,524,000        
Consol Coal Resources LP Units                  
Class of Stock [Line Items]                  
Stock and debt repurchase additional amount authorized             $ 25,000,000    
Stock repurchased (in shares)       6,884 0        
Stock repurchase price (in dollars per share)       $ 17.35          
CONSOL Coal Resources LP                  
Class of Stock [Line Items]                  
Stock and debt repurchase authorized amount           $ 175,000,000      
Stock and debt repurchase additional amount authorized           75,000,000      
Stock and debt repurchase restricted authorized amount           $ 50,000,000