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INVENTORIES (Details) - USD ($)
$ in Thousands
Jun. 29, 2019
Dec. 31, 2018
Inventory at FIFO    
Finished products $ 26,050 $ 17,313
Materials and work in process 66,569 62,975
Gross inventories 92,619 80,288
Less: LIFO reserve (47,529) (46,341)
Less: excess and obsolescence reserve (3,623) (2,527)
Net inventories $ 41,467 $ 31,420