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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Jan. 02, 2016
Inventory Disclosure [Abstract]    
Finished products $ 71,223 $ 68,478
Materials and work in process 71,375 81,860
LIFO reserve (24,160) (25,110)
Inventories, net $ 118,438 $ 125,228