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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Inventories [Abstract]    
Finished goods $ 261,627 $ 225,523
Work in process 12,219 10,711
Raw materials 131,030 109,268
Subtotal 404,876 345,502
Unreturned customer inventories 22,070 19,632
Total inventories $ 426,946 $ 365,134