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RELATED PARTY TRANSACTIONS - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2019
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
business
May 31, 2019
USD ($)
Nov. 28, 2017
USD ($)
Related Party Transaction [Line Items]                  
Payment of separation and distribution costs             $ 18,234,000    
Number of independent businesses | business             2    
Net payable   $ 0     $ 0   $ 0    
Purchase of CCR Units (in units) | shares   19,413 6,884 77,536          
Stock repurchase price (in dollars per share) | $ / shares   $ 16.97   $ 41.93 $ 19.06 $ 40.03      
CONSOL Coal Resources LP                  
Related Party Transaction [Line Items]                  
Net payable   $ 2,882,000     $ 2,882,000   3,831,000    
Stock and debt repurchase restricted authorized amount               $ 50,000,000  
Consol Coal Resources LP Units                  
Related Party Transaction [Line Items]                  
Shares converted | shares 11,611,067                
Conversion basis | shares 1                
Purchase of CCR Units (in units) | shares   19,413   77,536 26,297 77,536      
Stock repurchase price (in dollars per share) | $ / shares   $ 12.88   $ 17.86 $ 14.05 $ 17.86      
Senior Secured Revolving Credit Facility | Line of Credit                  
Related Party Transaction [Line Items]                  
Maximum borrowing capacity                 $ 400,000,000
CNX Resources Corporation                  
Related Party Transaction [Line Items]                  
Notes receivable, related parties   $ 6,666,000     $ 6,666,000   11,788,000    
Other receivables - related parties   6,666,000     6,666,000   5,500,000    
Accounts receivable, related parties, noncurrent             $ 6,288,000    
Affiliated Entity | Affiliated Company Credit Agreement | CONSOL Coal Resources LP                  
Related Party Transaction [Line Items]                  
Maximum borrowing capacity                 275,000,000
Line of credit amount drawn                 $ 201,000,000
Interest expense   $ 2,003,000   $ 1,832,000 $ 5,770,000 $ 5,942,000      
Minimum | Affiliated Entity | Affiliated Company Credit Agreement | CONSOL Coal Resources LP                  
Related Party Transaction [Line Items]                  
Stated interest rate   3.75%     3.75%        
Maximum | Affiliated Entity | Affiliated Company Credit Agreement | CONSOL Coal Resources LP                  
Related Party Transaction [Line Items]                  
Stated interest rate   4.75%     4.75%