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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 28, 2013
Dec. 29, 2012
Inventories [Abstract]    
Raw materials $ 62,732 $ 49,001
Work in process 21,446 17,058
Finished goods 67,519 61,176
Inventories, net $ 151,697 $ 127,235