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INVENTORIES (Details) - USD ($)
$ in Thousands
Apr. 01, 2017
Dec. 31, 2016
Inventory at FIFO    
Finished products $ 27,193 $ 24,100
Materials and work in process 73,585 75,317
Gross inventories 100,778 99,417
Less: LIFO reserve (43,267) (42,542)
Less: excess and obsolescence reserve (2,553) (2,340)
Net inventories $ 54,958 $ 54,535