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Select Balance Sheet Information - Schedule of Inventories (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Finished Goods | $ 37,195 | $ 39,903
Work in Process | 33,962 | 35,705
Raw Material, Fuel and Supplies | 74,700 | 72,882
Inventories | $ 145,857 | $ 148,490

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