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INVENTORIES (Details) - USD ($)
$ in Thousands
Sep. 26, 2015
Dec. 31, 2014
Inventory at FIFO    
Finished products $ 22,814 $ 20,083
Materials and work in process 62,715 68,934
Gross inventories 85,529 89,017
Less: LIFO reserve (42,308) (40,578)
Less: excess and obsolescence reserve (2,460) (3,750)
Net inventories $ 40,761 $ 44,689