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Inventories Inventories (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Inventory Disclosure [Abstract] |  |
Inventory, Finished Goods | $ 70,135 | $ 69,762
Inventory, Raw Materials | 4,125 | 3,503
Other Inventory, Supplies | 47,793 | 47,386
Inventory, Work in Process | 14,457 | 22,920
Inventories | $ 136,510 | $ 143,571

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