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WORKERS' COMPENSATION AND PNEUMOCONIOSIS - Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accrued Workers Compensation And Pneumoconiosis Benefits
Interest cost	$ 1,030	$ 1,217	$ 3,138	$ 3,649
Net amortization	969	980	3,096	2,941
Net periodic benefit cost	633	1,010	1,978	3,030
Pneumoconiosis benefits
Accrued Workers Compensation And Pneumoconiosis Benefits
Service cost	882	656	2,643	1,947
Interest cost	750	761	2,249	2,283
Net amortization	(172)	(1,145)	(515)	(3,436)
Net periodic benefit cost	$ 1,460	$ 272	$ 4,377	$ 794

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