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STOCK, UNIT AND DEBT REPURCHASE (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Jul. 31, 2019
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) 1,366,054 351,443 190,272 47,000 44,000 1,717,497 281,272          
Purchase of CCR Units (in units) 19,413 6,884 77,536                  
Stock repurchase price (in dollars per share) $ 16.97   $ 41.93     $ 19.06 $ 40.03          
Senior Notes | Senior Secured Notes due 2025                        
Class of Stock [Line Items]                        
Stated interest rate                   11.00% 11.00%  
Senior Notes | Senior Secured Second Lien Notes due 2025                        
Class of Stock [Line Items]                        
Stated interest rate 11.00%   11.00%     11.00% 11.00%         11.00%
Repayments of debt $ 15,728,000         $ 35,048,000 $ 20,524,000          
Consol Coal Resources LP Units                        
Class of Stock [Line Items]                        
Stock and debt repurchase additional amount authorized                   $ 25,000,000    
Purchase of CCR Units (in units) 19,413   77,536     26,297 77,536          
Stock repurchase price (in dollars per share) $ 12.88   $ 17.86     $ 14.05 $ 17.86          
CONSOL Coal Resources LP                        
Class of Stock [Line Items]                        
Stock and debt repurchase authorized amount               $ 200,000,000 $ 175,000,000      
Stock and debt repurchase additional amount authorized               $ 25,000,000 75,000,000      
Stock and debt repurchase restricted authorized amount                 $ 50,000,000