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Inventories, net (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Inventory Disclosure [Abstract]
Raw coal	$ 41,429	$ 39,689
Saleable coal	82,319	65,129
Materials, supplies and other, net	66,345	64,451
Total inventories, net	$ 190,093	$ 169,269

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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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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Aggregated amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. This amount is net of valuation reserves and adjustments.

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