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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - Recognized in AOCL (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive loss: |  |  |
Total recognized in accumulated other comprehensive loss | $ 23,445 | $ (9,681) | $ (31,122)
Pneumoconiosis benefits |  |  |
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive loss: |  |  |
Net actuarial loss | (161) | (7,787) | (23,298)
Reversal of amortization item: Net actuarial loss (gain) | 4,172 | (686) | (4,582)
Total recognized in accumulated other comprehensive loss | $ 4,011 | $ (8,473) | $ (27,880)
Estimated present value of future obligations and other information |  |  |
Pneumoconiosis discount rate | 2.73% | 2.38% | 3.12%
Amount recognized in accumulated other comprehensive income consists of: |  |  |
Net actuarial loss | $ 36,388 | $ 40,399 | $ 31,927

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