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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - AOCL (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive loss:
Total recognized in accumulated other comprehensive loss	$ (20,471)	$ 23,175	$ 23,445
Pneumoconiosis benefits
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive loss:
Net actuarial gain (loss)	(25,615)	9,840	(161)
Reversal of amortization item: Net actuarial loss (gain)	1,382	1,038	4,172
Total recognized in accumulated other comprehensive loss	$ (24,233)	$ 10,878	$ 4,011
Estimated present value of future obligations and other information
Pneumoconiosis discount rate	4.81%	5.00%	2.73%
Amount recognized in accumulated other comprehensive income consists of:
Net actuarial loss	$ 49,745	$ 25,510	$ 36,388

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