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Goodwill and Acquired Intangibles (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 30, 2013
Dec. 29, 2012
Estimated amortization expense    
2013-remaining period $ 20,395  
2014 25,404  
2015 25,057  
2016 24,348  
2017 23,260  
Thereafter 59,427  
Acquired Intangibles $ 177,891 $ 184,938