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OTHER LONG-TERM ASSETS (IN THOUSANDS) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
OTHER LONG-TERM ASSETS (IN THOUSANDS) |  |
Advanced coal royalties | $ 3,906 | $ 5,521
Other | 45 |
Total other assets | $ 3,951 | $ 5,521

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