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Inventories (Tables)
 9 Months Ended
Sep. 26, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories Inventories included in the Condensed Consolidated Balance Sheets consisted of the following (in thousands):
September 26,
2020		December 28,
2019
Finished products$107,792 $118,633 
Materials and work in process67,037 75,526 
Last-in, first-out ("LIFO") allowance(30,694)(30,694)
Total inventories$144,135 $163,465 
Inventory valued by the LIFO costing method81 %65 %