CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 9,084	$ 8,518	$ 132,751	$ 107,209
Other Comprehensive Income:
Actuarially Determined Long-Term Liability Adjustments (Net of tax: ($1,232), ($1,893), ($3,697), ($5,679))	4,177	3,285	12,356	9,855
Other Comprehensive Income	4,177	3,285	12,356	9,855
Comprehensive Income	13,261	11,803	145,107	117,064
Less: Comprehensive Income Attributable to Noncontrolling Interest	3,346	779	19,444	10,533
Comprehensive Income Attributable to CONSOL Energy Inc. Shareholders	$ 9,915	$ 11,024	$ 125,663	$ 106,531