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Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 26, 2021
Jun. 27, 2020
Jun. 26, 2021
Jun. 27, 2020
Investment Income, Net [Abstract]        
Interest and dividend income $ 45,956 $ 46,910 $ 94,626 $ 101,178
Net realized gain on investments 16,496 106,150 23,985 108,464
Investment income before fair value adjustment 62,452 153,060 118,611 209,642
Fair value adjustment, due to net unrealized gain, on equity securities held at end of period 128,961 597,408 913,811 209,981
Net gain on sale of equity securities previously recognized through fair value adjustment (9,441) (76,005) (9,441) (76,005)
Investment income $ 181,972 $ 674,463 $ 1,022,981 $ 343,618