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WORKERS' COMPENSATION AND PNEUMOCONIOSIS - Periodic Benefit Cost (Details) - Pneumoconiosis benefits - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Black lung benefits:
Service cost	$ 947	$ 1,031
Interest cost	747	636
Net amortization	260	1,043
Net periodic benefit cost	$ 1,954	$ 2,710

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