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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - Expense (Details) - Pneumoconiosis benefits - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Black lung benefits: |  |  |
Service cost | $ 3,798 | $ 4,021 | $ 3,526
Interest cost | $ 2,991 | $ 2,545 | $ 2,998
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 | $ 1,038 | $ 4,172 | $ (686)
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 expense | $ 7,827 | $ 10,738 | $ 5,838
Workers' compensation expense | 11,675 | 8,339 | 12,305
Net periodic benefit cost | $ 19,502 | $ 19,077 | $ 18,143

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