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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2013
Dec. 28, 2012
Inventory Disclosure [Abstract]    
Inventory Raw Materials $ 65,027 $ 58,204
Inventory, Work in Process 32,930 30,022
Inventory, Finished Goods 20,222 18,386
Inventories $ 118,179 $ 106,612