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Inventories (Tables)
3 Months Ended
Apr. 02, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories comprise the following (in thousands):
April 2,
2021
December 31,
2020
Raw materials$70,552 $72,477 
Work-in-process64,320 58,806 
Finished goods18,943 18,040 
Total$153,815 $149,323