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INVENTORIES (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
INVENTORIES
Coal	$ 38,531	$ 63,645
Supplies (net of reserve for obsolescence of $5,577 and $5,555, respectively)	36,348	37,660
Total inventories, net	74,879	101,305
Reserve for obsolescence	$ 5,577	$ 5,555

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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