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Investments Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Investment Income, Net [Abstract]        
Interest and Dividend Income $ 46,714 $ 31,061 $ 88,730 $ 60,153
Net realized gain on sale of investments 66,233 16,642 70,444 23,667
Investment Income Before Fair Value Adjustment 112,947 47,703 159,174 83,820
Fair value adjustment, due to net unrealized gain, on equity securities held at end of period 4,969 76,829 319,317 51,047
Net loss (gain) on sale of equity securities previously recognized through fair value adjustment 27,226 (16,217) 33,838 (22,414)
Investment Income $ 145,142 $ 108,315 $ 512,329 $ 112,453