CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 52,709	$ 52,246	$ 123,667	$ 98,690
Other Comprehensive Income:
Actuarially Determined Long-Term Liability Adjustments (Net of tax: ($1,183), ($1,819), ($2,464), ($3,786))	4,182	3,155	8,179	6,569
Other Comprehensive Income	4,182	3,155	8,179	6,569
Comprehensive Income	56,891	55,401	131,846	105,259
Less: Comprehensive Income Attributable to Noncontrolling Interest	7,550	4,302	16,098	9,754
Comprehensive Income Attributable to CONSOL Energy Inc. Shareholders	$ 49,341	$ 51,099	$ 115,748	$ 95,505