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Subsequent Events (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 14, 2020
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Senior Notes due April 2022          
Subsequent Event [Line Items]          
Stated rate, debt instrument     5.875% 5.875% 5.875%
Purchase of outstanding debt     $ 409,625 $ 480,959 $ 400,000
Subsequent Event | Forecast | Senior Notes due April 2022          
Subsequent Event [Line Items]          
Purchase of outstanding debt $ 50,000        
Redemption price 100.00%        
Subsequent Event | Forecast | CNXM, CNX Midstream GP LLC, CNX Resources Holding LLC Merger Agreement          
Subsequent Event [Line Items]          
Entity shares issued per acquiree share (in shares)   0.88