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Investments and Fair Value Measurements-AFS Realized Gains and Losses (Details 6) - USD ($)
$ in Thousands
12 Months Ended
Jan. 03, 2016
Dec. 28, 2014
Dec. 29, 2013
Gross realized gains and (losses) on sales of available-for-sale securities      
Realized gains $ 6,807 $ 8,918 $ 4,724
Realized losses (3,157) (1,375) (2,349)
Net realized gains $ 3,650 $ 7,543 $ 2,375