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Nature of Operations and Summary of Significant Accounting Policies (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]      
Non-marketable equity investments (equity method) $ 18,949us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 19,455us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 17,487us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures