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Fair Value Measurements (Narratives) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2018
Dec. 29, 2017
Dec. 30, 2016
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Equity method investment $ 15,148 $ 13,800  
Net gains on equity method investments $ (5,623) $ (3,685) $ (737)
Chinese Venture Capital Fund [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of ownership interest 6.70%