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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS      
Workers' compensation claims $ 47,975 $ 49,452 $ 53,448
Pneumoconiosis benefit claims 132,444 104,287  
Total obligations 180,419 153,739  
Less current portion (15,913) (14,099)  
Non-current obligations $ 164,506 $ 139,640