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WORKERS' COMPENSATION AND PNEUMOCONIOSIS - Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accrued Workers Compensation And Pneumoconiosis Benefits
Interest cost	$ 860	$ 1,054
Net amortization	1,141	1,064
Net periodic benefit cost	377	672
Pneumoconiosis benefits
Accrued Workers Compensation And Pneumoconiosis Benefits
Service cost	1,031	878
Interest cost	636	750
Net amortization	1,043	(172)
Net periodic benefit cost	$ 2,710	$ 1,456

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