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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Inventory Disclosure [Abstract]      
Raw materials $ 149,488 $ 95,777 $ 100,198
In-process products 28,399 21,803 21,533
Finished products 207,625 166,162 138,323
Total inventories $ 385,512 $ 283,742 $ 260,054