COMBINED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 8,518	$ 4,751	$ 107,209	$ 27,536
Other Comprehensive Income:
Actuarially Determined Long-Term Liability Adjustments (Net of Tax: ($1,893), ($820), ($5,679), ($4,441))	3,285	1,423	9,855	7,707
Other Comprehensive Income	3,285	1,423	9,855	7,707
Comprehensive Income	11,803	6,174	117,064	35,243
Less: Comprehensive Income Attributable to Noncontrolling Interest	779	2,248	10,533	4,541
Comprehensive Income Attributable to CONSOL Energy Inc. Shareholder	$ 11,024	$ 3,926	$ 106,531	$ 30,702