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Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Sep. 26, 2021
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]      
Raw materials $ 48,665 $ 44,474 $ 44,146
Work-in-process 18,960 12,946 14,164
Finished goods 96,718 76,508 63,686
Inventory, Net, Total $ 164,343 $ 133,928 $ 121,996