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Inventories, net (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021
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Inventory Disclosure [Abstract] |  |  |
Coal | $ 96,311 | $ 24,185 |
Raw materials, parts, supplies and other, net | 44,107 | 35,434 |
Total inventories, net | $ 140,418 | $ 59,619 | $ 140,418

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