Components of Coal Workers' Pneumoconiosis and Workers' Compensation Net Periodic Benefit Costs (Tables)

6 Months Ended

Jun. 30, 2023

Retirement Benefits [Abstract]

Schedule of Changes in Accumulated Postemployment Benefit Obligations

The components of Net Periodic Benefit Cost are as follows:

	CWP								Workers' Compensation
	Three Months Ended June 30,				Six Months Ended June 30,				Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022		2023		2022		2023		2022
Service Cost	$	578	$	726	$	1,156	$	1,452	$	1,399	$	1,230	$	2,798	$	2,460
Interest Cost	2,072		1,265		4,143		2,530		629		342		1,257		684
Amortization of Actuarial (Gain) Loss	(262)		1,059		(523)		2,119		(513)		(105)		(1,025)		(210)
State Administrative Fees and Insurance Bond Premiums	—		—		—		—		466		448		1,011		885
Net Periodic Benefit Cost	$	2,388	$	3,050	$	4,776	$	6,101	$	1,981	$	1,915	$	4,041	$	3,819