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Inventories (Tables)
9 Months Ended
Sep. 28, 2019
Inventory Disclosure [Abstract]  
Inventory, Net of Reserves
Inventories are classified as follows (in thousands):
                 
 
September 28, 2019
   
December 31, 2018
 
Raw materials
  $
126,326
    $
111,641
 
Work in progress
   
20,705
     
15,552
 
Finished goods
   
221,759
     
164,376
 
                 
Total inventories
  $
368,790
    $
291,569