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INVENTORIES (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
INVENTORIES
Coal	$ 56,084	$ 24,845
Supplies (net of reserve for obsolescence of $5,571 and $5,554, respectively)	39,661	35,457
Total inventories, net	95,745	60,302
Reserve for obsolescence	$ 5,571	$ 5,554

X

- 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.

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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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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

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Amount of valuation reserve for inventory.

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