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Inventories (Details) - USD ($)
$ in Thousands
Jul. 01, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Percentage of LIFO Inventory 85.00%  
Inventories    
Finished products $ 107,874 $ 71,223
Materials and work in process 83,491 71,375
LIFO allowance (24,160) (24,160)
Inventories $ 167,205 $ 118,438