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Summary of Significant Accounting Policies - Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Accounting Policies [Abstract]    
Finished Goods $ 43,812 $ 39,903
Work in Process 31,766 35,705
Raw Material, Fuel and Supplies 70,374 72,882
Total Inventories $ 145,952 $ 148,490