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Inventories, net (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Inventory Disclosure [Abstract] |  |
Coal | $ 87,684 | $ 69,064
Raw materials, parts, supplies and other, net | 29,879 | 28,837
Total inventories, net | $ 117,563 | $ 97,901

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