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Goodwill and Acquired Intangibles (Details 3) (USD $)
In Thousands, unless otherwise specified
Sep. 28, 2013
Dec. 29, 2012
Estimated amortization expense    
2013-remaining period $ 12,446  
2014 49,929  
2015 49,378  
2016 43,666  
2017 40,060  
Thereafter 128,328  
Acquired intangibles $ 323,807 $ 184,938