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Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 25, 2022
Jun. 26, 2021
Jun. 25, 2022
Jun. 26, 2021
Investment Income, Net [Abstract]        
Interest and dividend income $ 54,764 $ 45,956 $ 111,518 $ 94,626
Net realized gain on investments 110 16,496 1,218 23,985
Investment income before fair value adjustment 54,874 62,452 112,736 118,611
Fair value adjustment, due to net unrealized (loss) gain, on equity securities held at end of period (358,122) 128,961 (938,960) 913,811
Net gain on sale of equity securities previously recognized through fair value adjustment 0 (9,441) 0 (9,441)
Investment (loss) $ (303,248)   $ (826,224)  
Investment income   $ 181,972   $ 1,022,981