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

9 Months Ended

Sep. 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 September 30,				Nine Months Ended September 30,				Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022		2023		2022		2023		2022
Service Cost	$	578	$	727	$	1,734	$	2,179	$	1,400	$	1,230	$	4,198	$	3,690
Interest Cost	2,071		1,265		6,214		3,795		628		343		1,885		1,027
Amortization of Actuarial (Gain) Loss	(261)		1,059		(784)		3,178		(512)		(106)		(1,537)		(316)
State Administrative Fees and Insurance Bond Premiums	—		—		—		—		471		449		1,482		1,334
Net Periodic Benefit Cost	$	2,388	$	3,051	$	7,164	$	9,152	$	1,987	$	1,916	$	6,028	$	5,735