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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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Carrying amount as of the balance sheet date of coal, which is a combustible rock or minerals which are extracted from the ground and used as fuel.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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