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Variable Interest Entities (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Mar. 31, 2018
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Variable Interest Entity [Line Items]        
Payable to affiliates   $ 14,085 $ 12,202  
Senior Notes due March 2026        
Variable Interest Entity [Line Items]        
Stated rate, debt instrument       6.50%
CNX Midstream Partners LP | Senior Notes due March 2026        
Variable Interest Entity [Line Items]        
Stated rate, debt instrument 6.50%      
Shirley-Penns System        
Variable Interest Entity [Line Items]        
Ownership percentage by parent 95.00%      
Cash consideration transferred $ 265,000      
Limited Partner | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Variable interest entity, ownership percentage   34.00%    
General Partner | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Variable interest entity, ownership percentage   100.00%