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INVENTORIES (Details) - USD ($)
$ in Thousands
Oct. 01, 2016
Dec. 31, 2015
Inventory at FIFO    
Finished products $ 19,123 $ 16,637
Materials and work in process 70,735 64,641
Gross inventories 89,858 81,278
Less: LIFO reserve (43,836) (42,061)
Less: excess and obsolescence reserve (2,448) (2,118)
Net inventories $ 43,574 $ 37,099