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Inventories (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Inventory [Line Items] |  |
Coal | $ 48,208 | $ 37,290
Finished goods (net of reserve for obsolescence of $2,366 and $2,481, respectively) | 13,095 | 14,197
Work in process | 1,074 | 1,560
Raw materials | 6,634 | 7,192
Total operating inventories, net | 69,011 | 60,239
Supplies (net of reserve for obsolescence of $7,152 and $6,409, respectively) | 61,625 | 60,422
Total inventories, net | 130,636 | 120,661
Reduce inventory carrying value to market | 3,400 | 24,600
Manufactured goods |  |
Inventory [Line Items] |  |
Reserve for obsolescence | 1,180 | 2,481
Supplies |  |
Inventory [Line Items] |  |
Reserve for obsolescence | $ 7,311 | $ 6,409

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