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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - Expense (Details) - Pneumoconiosis benefits - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Black lung benefits: |  |  |
Service cost | $ 4,021 | $ 3,526 | $ 2,593
Interest cost | 2,545 | 2,998 | 3,044
Net amortization | 4,172 | (686) | (4,582)
Total pneumoconiosis expense | 19,077 | 18,143 | 18,596
Workers' compensation expense | 8,339 | 12,305 | 17,541
Net periodic benefit cost | $ 10,738 | $ 5,838 | $ 1,055

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