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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - AOCL (Details) - Pneumoconiosis benefits - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive loss: |  |  |
Net actuarial gain (loss) | $ 13,990 | $ (25,615) | $ 9,840
Reversal of amortization item: Net actuarial loss (gain) | 3,356 | 1,382 | 1,038
Total recognized in accumulated other comprehensive Income | $ 17,346 | $ (24,233) | $ 10,878
Estimated present value of future obligations and other information |  |  |
Pneumoconiosis discount rate | 5.51% | 4.81% | 5.00%
Amount recognized in accumulated other comprehensive income consists of: |  |  |
Net actuarial loss | $ 32,399 | $ 49,745 | $ 25,510

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