Segment Information - Schedule of Adjusted EBITDA (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net Income	$ 655,892	$ 466,979	$ 34,110
Income Tax Expense	121,980	101,458	1,297
Interest Expense	29,325	52,640	63,342
Interest Income	(13,597)	(6,031)	(3,287)
Depreciation, Depletion and Amortization	241,317	226,878	224,583
Stock-Based Compensation	10,046	7,890	6,632
Pension Settlement			22
Loss (Gain) on Debt Extinguishment	2,725	$ 5,623	(657)
Defined benefit plan, net periodic benefit cost (credit) excluding service cost, statement of income or comprehensive income		Operating and Other Costs
Settlement loss recognized		$ 3,500
Fair Value Adjustment of Commodity Derivative Instruments		(52,204)	(52,204)
Adjusted EBITDA	1,047,688	806,733	378,246
Corporate And Reconciling Items
Segment Reporting Information [Line Items]
Net Income	(223,595)	(194,452)	(92,302)
Income Tax Expense	121,980	101,458	1,297
Interest Expense	23,228	46,524	55,491
Interest Income	(11,253)	(4,174)	(3,197)
Depreciation, Depletion and Amortization	33,813	21,954	13,022
Stock-Based Compensation	1,307	946	599
Pension Settlement			22
Loss (Gain) on Debt Extinguishment	2,725	5,623	(657)
Settlement loss recognized		3,500
Fair Value Adjustment of Commodity Derivative Instruments		0	0
Adjusted EBITDA	(51,795)	(18,621)	(25,725)
PAMC | Operating Segments
Segment Reporting Information [Line Items]
Net Income	810,234	620,208	94,161
Income Tax Expense	0	0	0
Interest Expense	0	0	1,710
Interest Income	(2,344)	(1,857)	(90)
Depreciation, Depletion and Amortization	202,833	200,320	206,727
Stock-Based Compensation	8,438	6,628	5,768
Pension Settlement			0
Loss (Gain) on Debt Extinguishment	0	0	0
Settlement loss recognized		0
Fair Value Adjustment of Commodity Derivative Instruments		(52,204)	(52,204)
Adjusted EBITDA	1,019,161	773,095	360,480
CONSOL Marine Terminal | Operating Segments
Segment Reporting Information [Line Items]
Net Income	69,253	41,223	32,251
Income Tax Expense	0	0	0
Interest Expense	6,097	6,116	6,141
Interest Income	0	0	0
Depreciation, Depletion and Amortization	4,671	4,604	4,834
Stock-Based Compensation	301	316	265
Pension Settlement			0
Loss (Gain) on Debt Extinguishment	0	0	0
Settlement loss recognized		0
Fair Value Adjustment of Commodity Derivative Instruments		0	0
Adjusted EBITDA	$ 80,322	$ 52,259	$ 43,491