BASIS OF PRESENTATION - Schedule of Basic and Dilutive Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net Income	$ 2,475	$ 20,303
Less: Net Income Attributable to Noncontrolling Interest	108	5,868
Net Income Attributable to CONSOL Energy Inc. Shareholders	$ 2,367	$ 14,435
Denominator:
Weighted-average shares of common stock outstanding	25,987,155	27,530,859
Effect of dilutive shares	265,056	308,534
Weighted-average diluted shares of common stock outstanding	26,252,211	27,839,393
Earnings per Share:
Basic (in dollars per share)	$ 0.09	$ 0.52
Dilutive (in dollars per share)	$ 0.09	$ 0.52