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WORKERS' COMPENSATION AND PNEUMOCONIOSIS (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Reconciliation of changes in the workers' compensation liability    
Beginning balance $ 47,975 $ 49,452
Changes in accruals 3,125 3,874
Payments (4,048) (3,859)
Interest accretion 509 550
Ending balance 47,561 $ 50,017
Other long-term assets    
Estimated present value of future obligations and other information    
Receivables for traumatic injury claims $ 4,100