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IMPAIRMENT OF COAL PROPERTIES (Details) $ in Thousands, T in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 USD ($) T | Dec. 31, 2024 USD ($) T | Dec. 31, 2023 USD ($)
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |
Impairment charge | $ | $ 215,100 | $ 215,136 | $ 0
Level 3 |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |
Discount rate |  | 11.50% |
Production capacity | T | 3.6 | 3.6 |

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