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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS - Benefit cost (Details) - Pneumoconiosis benefits - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Black lung benefits:      
Service cost $ 3,443 $ 2,698 $ 3,798
Interest cost $ 6,231 $ 4,951 $ 2,991
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Net amortization $ 3,356 $ 1,382 $ 1,038
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Total pneumoconiosis and workers' compensation expense $ 13,030 $ 9,031 $ 7,827
Workers' compensation expense 18,155 15,152 11,675
Net periodic benefit cost $ 31,185 $ 24,183 $ 19,502