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Inventories
3 Months Ended
Mar. 28, 2020
Inventory Disclosure [Abstract]  
Inventories
4 Inventories
Inventories are classified as follows (in thousands):
 
March 28, 2020
 
 
December 31, 2019
 
Raw materials
  $
128,018
    $
126,850
 
Work in progress
   
19,364
     
15,457
 
Finished goods
   
196,627
     
178,244
 
                 
Total inventories
  $
344,009
    $
320,551