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INVENTORIES (Details) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 31, 2018
Inventory at FIFO    
Finished products $ 16,897 $ 17,313
Materials and work in process 67,763 62,975
Gross inventories 84,660 80,288
Less: LIFO reserve (48,113) (46,341)
Less: excess and obsolescence reserve (3,566) (2,527)
Net inventories $ 32,981 $ 31,420