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Inventories (Tables)
9 Months Ended
Oct. 01, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories comprise the following (in thousands):
October 1,
2021
December 31,
2020
Raw materials$65,108 $72,477 
Work-in-process73,556 58,806 
Finished goods10,571 18,040 
Total$149,235 $149,323