CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Total CONSOL Energy Inc. Stockholders' Equity	Noncontrolling Interest	Actuarially Determined Long-Term Liability Adjustments (Net of $1,214 Tax)	Actuarially Determined Long-Term Liability Adjustments (Net of $1,214 Tax) Retained Earnings	Actuarially Determined Long-Term Liability Adjustments (Net of $1,214 Tax) Total CONSOL Energy Inc. Stockholders' Equity
Beginning balance at Dec. 31, 2018	$ 551,611	$ 274	$ 550,995	$ 182,148	$ (323,482)	$ 409,935	$ 141,676
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	20,303			14,435		14,435	5,868
Net Actuarial Gain (Loss)	2,460				2,461	2,461	(1)
Interest Rate Hedge, Net	0
Comprehensive Income	22,763			14,435	2,461	16,896	5,867
Issuance of Common Stock	0	2	(2)
Amortization of Stock-Based Compensation Awards	7,450		7,053			7,053	397
Shares/Units Withheld for Taxes	(4,743)		(3,863)			(3,863)	(880)
Distributions to Noncontrolling Interest	(5,559)						(5,559)
Ending balance at Mar. 31, 2019	571,522	276	554,183	196,583	(321,021)	430,021	141,501
Beginning balance at Dec. 31, 2019	572,395	259	523,762	259,903	(348,725)	435,199	137,196	$ (3,298)	$ (3,298)	$ (3,298)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	2,475			2,367		2,367	108
Net Actuarial Gain (Loss)	3,624				3,609	3,609	15
Interest Rate Hedge, Net	(2,773)				(2,773)	(2,773)
Comprehensive Income	3,326			2,367	836	3,203	123
Issuance of Common Stock	0	1	(1)
Amortization of Stock-Based Compensation Awards	5,014		4,856			4,856	158
Shares/Units Withheld for Taxes	(772)		(555)			(555)	(217)
Distributions to Noncontrolling Interest	(5,575)						(5,575)
Ending balance at Mar. 31, 2020	$ 571,090	$ 260	$ 528,062	$ 258,972	$ (347,889)	$ 439,405	$ 131,685