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INVENTORIES (Details) - USD ($)
$ in Thousands
Mar. 30, 2019
Dec. 31, 2018
Inventory at FIFO    
Finished products $ 21,430 $ 17,313
Materials and work in process 64,932 62,975
Gross inventories 86,362 80,288
Less: LIFO reserve (46,944) (46,341)
Less: excess and obsolescence reserve (2,936) (2,527)
Net inventories $ 36,482 $ 31,420