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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - Expense (Details) - Pneumoconiosis benefits - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Black lung benefits:      
Service cost $ 2,698 $ 3,798 $ 4,021
Interest cost $ 4,951 $ 2,991 $ 2,545
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 $ 1,382 $ 1,038 $ 4,172
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 $ 9,031 $ 7,827 $ 10,738
Workers' compensation expense 15,152 11,675 8,339
Net periodic benefit cost $ 24,183 $ 19,502 $ 19,077