BASIS OF PRESENTATION - Schedule of Basic and Dilutive Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net Income	$ 20,303	$ 70,958
Less: Net Income Attributable to Noncontrolling Interest	5,868	8,550
Net Income Attributable to CONSOL Energy Inc. Shareholders	$ 14,435	$ 62,408
Denominator:
Weighted-average shares of common stock outstanding (in shares)	27,530,859	28,029,146
Effect of dilutive shares (in shares)	308,534	295,724
Weighted-average diluted shares of common stock outstanding (in shares)	27,839,393	28,324,870
Earnings per Share:
Basic (in dollars per share)	$ 0.52	$ 2.23
Dilutive (in dollars per share)	$ 0.52	$ 2.20