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STOCK, UNIT AND DEBT REPURCHASES (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jul. 31, 2019
May 31, 2019
Dec. 31, 2018
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  
11.00% Senior Secured Second Lien Notes due November 2025              
Class of Stock [Line Items]              
Repayments of debt $ 25,480,000 $ 7,000,000          
Senior Notes | Senior Secured Notes due 2025              
Class of Stock [Line Items]              
Stated interest rate         11.00% 11.00%  
Senior Notes | 11.00% Senior Secured Second Lien Notes due November 2025              
Class of Stock [Line Items]              
Stated interest rate 11.00%           11.00%
Repayments of debt $ 43,176,000 $ 7,000,000          
Consol Coal Resources LP Units              
Class of Stock [Line Items]              
Stock and debt repurchase additional amount authorized           $ 25,000,000  
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