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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - Recognized in Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS      
Workers' compensation claims $ 53,448 $ 54,739 $ 53,384
Pneumoconiosis benefit claims 111,316 108,496  
Total obligations 164,764 163,235  
Less current portion (12,293) (10,646)  
Non-current obligations $ 152,471 $ 152,589