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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 29, 2012
Dec. 31, 2011
Inventories [Abstract]    
Raw materials $ 51,251 $ 49,236
Work in process 18,172 20,968
Finished goods 61,346 63,592
Inventories, net $ 130,769 $ 133,796