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Inventories, net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Coal	$ 53,161	$ 86,272
Raw materials, parts, supplies and other, net	40,865	32,441
Total inventories, net	$ 94,026	$ 118,713

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- Definition

Inventory, Raw Materials, Purchased Parts, Supplies and Other, Net of Reserve

+ References

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- Definition

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.

+ References

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- Definition

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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