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INVENTORIES (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
INVENTORIES |  |
Coal | $ 51,418 | $ 63,645
Supplies (net of reserve for obsolescence of $5,762 and $5,555, respectively) | 36,975 | 37,660
Total inventories, net | 88,393 | 101,305
Reserve for obsolescence | 5,762 | $ 5,555
Reduce inventory carrying value to market | $ 16,900 |

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