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Inventories
6 Months Ended
Jul. 03, 2021
Inventory Disclosure [Abstract]  
Inventories
4 Inventories
Inventories are classified as follows (in thousands):
 
    
July 3, 2021
    
December 31, 2020
 
Raw materials
   $ 149,562      $ 133,490  
Work in progress
     23,224        18,678  
Finished goods
     175,984        152,113  
    
 
 
    
 
 
 
Total inventories
   $ 348,770      $ 304,281