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INVENTORIES (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
INVENTORIES
Coal	$ 63,645	$ 20,929
Supplies (net of reserve for obsolescence of $5,564 and $5,453, respectively)	37,660	38,277
Total inventories, net	101,305	59,206
Reserve for obsolescence	$ 5,555	$ 5,453

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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.

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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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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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