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Inventories
6 Months Ended
Jun. 27, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
A summary of inventories follows (in thousands):
         
 June 27, 2020December 28, 2019
Finished product$223,792  $199,799  
Work in process91,136  81,841  
Raw material37,663  41,964  
Supplies and other42,117  39,353  
 $394,708  $362,957