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WORKERS' COMPENSATION AND PNEUMOCONIOSIS - Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accrued Workers Compensation And Pneumoconiosis Benefits
Interest cost	$ 860	$ 1,030	$ 2,580	$ 3,138
Net amortization	1,141	969	3,424	3,096
Net periodic benefit cost	377	633	1,131	1,978
Pneumoconiosis benefits
Accrued Workers Compensation And Pneumoconiosis Benefits
Service cost	1,007	882	3,027	2,643
Interest cost	636	750	1,909	2,249
Net amortization	1,043	(172)	3,129	(515)
Net periodic benefit cost	$ 2,686	$ 1,460	$ 8,065	$ 4,377

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