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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Percentage of LIFO Inventory 86.00%  
Inventories    
Finished products $ 98,844 $ 101,715
Materials and work in process 87,226 81,202
LIFO allowance (27,382) (27,234)
Total inventories $ 158,688 $ 155,683