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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Inventories [Abstract]    
Finished goods $ 279,147 $ 225,523
Work in process 14,842 10,711
Raw materials 120,668 109,268
Subtotal 414,657 345,502
Unreturned customer inventories 23,367 19,632
Total inventories $ 438,024 $ 365,134