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INVENTORIES (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
INVENTORIES |  |
Coal | $ 86,871 | $ 63,645
Supplies (net of reserve for obsolescence of $5,839 and $5,555, respectively) | 37,645 | 37,660
Total inventories, net | 124,516 | 101,305
Reserve for obsolescence | 5,839 | $ 5,555
Reduce inventory carrying value to market | $ 5,400 |

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