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Inventories (Tables)
9 Months Ended
Sep. 26, 2020
Inventory Disclosure [Abstract]  
Inventory, Net of Reserves
Inventories are classified as follows (in thousands):
 
    
September 26, 2020
    
December 31, 2019
 
Raw materials
   $ 134,527      $ 126,850  
Work in progress
     20,183        15,457  
Finished goods
     172,236        178,244  
  
 
 
    
 
 
 
Total inventories
   $ 326,946      $ 320,551