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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - Pneum Roll (Details) - Pneumoconiosis benefits - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of the changes in black lung benefit obligations      
Benefit obligations at beginning of year $ 132,444 $ 104,287  
Service cost 3,443 2,698 $ 3,798
Interest cost 6,231 4,951 2,991
Actuarial loss (gain) (13,990) 25,615  
Benefits and expenses paid (3,831) (5,107)  
Benefit obligations at end of year $ 124,297 $ 132,444 $ 104,287