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Investments Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Investment Income, Net [Abstract]        
Interest and dividend income $ 47,061 $ 46,796 $ 148,239 $ 135,526
Net realized gain on investments 109,132 33,798 217,596 104,242
Investment income before fair value adjustment 156,193 80,594 365,835 239,768
Fair value adjustment, due to net unrealized gain (loss), on equity securities held at end of period 130,637 (26,936) 340,618 292,381
Net (gain) loss on sale of equity securities previously recognized through fair value adjustment (21,535) 16,391 (97,540) 50,229
Investment income $ 265,295 $ 70,049 $ 608,913 $ 582,378