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Investments Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Investment Income, Net [Abstract]        
Interest and Dividend Income $ 46,796 $ 32,726 $ 135,526 $ 92,879
Net realized gain on sale of investments 33,798 69,251 104,242 92,918
Investment Income Before Fair Value Adjustment 80,594 101,977 239,768 185,797
Fair value adjustment, due to net unrealized (loss) gain, on equity securities held at end of period (26,936) 166,267 292,381 217,314
Net loss (gain) on sale of equity securities previously recognized through fair value adjustment 16,391 (38,010) 50,229 (60,424)
Investment Income $ 70,049 $ 230,234 $ 582,378 $ 342,687