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INVENTORIES (Details) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 31, 2019
Inventory at FIFO    
Finished products $ 3,734 $ 13,131
Materials and work in process 60,192 65,880
Gross inventories 63,926 79,011
Less: LIFO reserve (47,331) (47,137)
Less: excess and obsolescence reserve (3,016) (3,573)
Net inventories $ 13,579 $ 28,301