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Investments Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Investment Income, Net [Abstract]        
Interest Income $ 21,822 $ 16,984 $ 60,077 $ 59,031
Dividend income 10,904 11,123 32,802 28,994
Net realized gain on sale of investments 69,251 10,323 92,918 104,881
Investment Income Before Fair Value Adjustment 101,977 38,430 185,797 192,906
Fair value adjustment (net unrealized gain) on equity securities held at end of period 166,267 0 217,314 0
Net gain on sale of equity securities previously recognized through fair value adjustment (38,010) 0 (60,424) 0
Investment Income $ 230,234 $ 38,430 $ 342,687 $ 192,906