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Variable Interest Entities (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]        
Payable to affiliates   $ 9,495   $ 9,982
Variable Interest Entity, Primary Beneficiary [Member]        
Variable Interest Entity [Line Items]        
Variable interest entity, ownership percentage   34.00%    
CNX Midstream Partners LP [Member] | Senior Notes due March 2026 [Member]        
Variable Interest Entity [Line Items]        
Stated rate, debt instrument     6.50%  
Shirley-Penns System [Member]        
Variable Interest Entity [Line Items]        
Ownership percentage by parent     95.00%  
Cash consideration transferred $ 265,000