Supplemental Quarterly Info (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 504,747	$ 526,681	$ 602,109	$ 275,234	$ 431,660	$ 393,223	$ 393,590	$ 485,019	$ 1,922,449	$ 1,730,434	$ 1,455,131
Costs and Expenses	182,035	153,833	153,835	147,928	148,480	123,779	140,040	167,785	1,862,765	631,766	1,336,550
Net Income	(240,055)	143,960	192,694	(64,651)	129,415	146,756	61,394	545,546	31,948	883,111	380,747
Net (Loss) Income Attributable to CNX Resources Shareholders	$ (271,408)	$ 115,538	$ 162,477	$ (87,337)	$ 101,927	$ 125,029	$ 42,014	$ 527,563	$ (80,730)	$ 796,533	$ 380,747
(Loss) Earnings Per Share
Basic earnings per share (in usd per share)	$ (1.45)	$ 0.62	$ 0.85	$ (0.44)	$ 0.51	$ 0.59	$ 0.19	$ 2.38	$ (0.42)	$ 3.75	$ 1.66
Diluted earnings per share (in usd per share)	$ (1.45)	$ 0.61	$ 0.84	$ (0.44)	$ 0.50	$ 0.59	$ 0.19	$ 2.35	$ (0.42)	$ 3.71	$ 1.65
Impairment of Exploration and Production Properties	$ 327,400						$ 18,650		$ 327,400	$ 0	$ 137,865
Impairment of Unproved Properties and Expirations									$ 119,429	$ 0	$ 0