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Summary of Significant Accounting Policies - Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Finished Goods $ 39,903 $ 22,046
Work in Process 35,705 16,210
Raw Material, Fuel and Supplies 72,882 53,909
Total Inventories $ 148,490 $ 92,165