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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 30, 2013
Dec. 29, 2012
Inventories [Abstract]    
Raw materials $ 52,357 $ 51,251
Work in process 17,740 18,172
Finished goods 65,739 61,346
Inventories, net $ 135,836 $ 130,769