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WORKERS' COMPENSATION AND PNEUMOCONIOSIS - Benefit cost (Details) - Pneumoconiosis benefits - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Black lung benefits:        
Service cost $ 858 $ 675 $ 1,719 $ 1,344
Interest cost $ 1,558 $ 1,238 $ 3,116 $ 2,476
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) Other Nonoperating Income (Expense)
Net amortization $ 839 $ 346 $ 1,678 $ 691
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) Other Nonoperating Income (Expense)
Net periodic benefit cost $ 3,255 $ 2,259 $ 6,513 $ 4,511