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Variable Interest Entities (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Mar. 31, 2018
Jun. 30, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]      
Payable to affiliates   $ 15,584 $ 12,202
Variable Interest Entity, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Variable interest entity, ownership percentage   34.00%  
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