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INVENTORIES (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 28, 2014
Dec. 31, 2013
Inventory at FIFO    
Finished products $ 16,796 $ 6,552
Materials and work in process 66,237 57,647
Gross inventories 83,033 64,199
Less LIFO reserve (39,291) (38,516)
Less excess and obsolescence reserve (3,363) (2,422)
Net inventories $ 40,379 $ 23,261