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INVENTORIES (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 31, 2017
Inventory at FIFO    
Finished products $ 13,613 $ 22,558
Materials and work in process 60,585 65,034
Gross inventories 74,198 87,592
Less: LIFO reserve (45,811) (45,180)
Less: excess and obsolescence reserve (2,195) (2,698)
Net inventories $ 26,192 $ 39,714