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Goodwill and Acquired Intangibles (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 29, 2012
Dec. 31, 2011
Estimated amortization expense    
2013 $ 27,914  
2014 25,178  
2015 24,831  
2016 24,307  
2017 23,257  
Thereafter 59,451  
Acquired Intangibles, Net $ 184,938 $ 173,234