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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 91,229 $ 74,302
Work-in-process 24,440 22,913
Finished goods 209,819 260,467
Inventories $ 325,488 $ 357,682