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Supplemental Quarterly Information (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 622,131 $ 61,609 $ 145,088 $ 411,401 $ 504,747 $ 526,681 $ 602,109 $ 275,234      
Expenses 134,775 142,327 125,548 149,004 182,035 153,833 153,835 147,928      
Net (Loss) Income 195,758 (188,793) (130,487) (305,222) (240,055) 143,960 192,694 (64,651) $ (428,744) $ 31,948 $ 883,111
Net (Loss) Income Attributable to CNX Resources Shareholders $ 195,758 $ (204,698) $ (145,749) $ (329,086) $ (271,408) $ 115,538 $ 162,477 $ (87,337) $ (483,775) $ (80,730) $ 796,533
(Loss) Earnings Per Share:                      
Basic (Loss) Earnings Per Share (in usd per share) $ 0.88 $ (1.03) $ (0.78) $ (1.76) $ (1.45) $ 0.62 $ 0.85 $ (0.44) $ (2.43) $ (0.42) $ 3.75
Diluted (Loss) Earnings Per Share (in usd per share) $ 0.87 $ (1.03) $ (0.78) $ (1.76) $ (1.45) $ 0.61 $ 0.84 $ (0.44) $ (2.43) $ (0.42) $ 3.71
Impairment of Unproved Properties and Expirations       $ 473,045 $ 119,429       $ 0 $ 119,429 $ 0
Impairment of Exploration and Production Properties       $ 61,849 $ 327,400       $ 61,849 $ 327,400 $ 0