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Inventories (Tables)
 6 Months Ended
Jun. 27, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories Inventories included in the Condensed Consolidated Balance Sheets consisted of the following (in thousands):
June 27,
2020		December 28,
2019
Finished products$117,601  $118,633  
Materials and work in process69,740  75,526  
Last-in, first-out ("LIFO") allowance(30,694) (30,694) 
Total inventories$156,647  $163,465  
Inventory valued by the LIFO costing method81 %65 %