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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

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