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Inventories - Major Classes of Inventories (Details) - USD ($)
$ in Thousands
Sep. 27, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 112,957 $ 98,530
Work-in-process 34,348 34,717
Finished goods 125,774 119,331
Gross inventories 273,079 252,578
Excess and obsolete reserves (28,264) (21,245)
Net inventories $ 244,815 $ 231,333