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Inventories, net (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Inventory Disclosure [Abstract]
Raw coal	$ 51,456	$ 41,665
Saleable coal	136,335	81,919
Materials, supplies and other, net	74,644	69,416
Total inventories, net	$ 262,435	$ 193,000

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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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