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Inventories, Net (Tables)
12 Months Ended
Dec. 26, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories are summarized as follows:
20202019
Raw materials$31,167 $32,377 
Work-in-process13,305 18,642 
Finished goods59,271 64,978 
Supplies and other167 260 
LIFO reserve(18,511)(20,748)
Inventories, net$85,399 $95,509