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Investments Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Investment Income, Net [Abstract]    
Interest and Dividend Income $ 42,016 $ 29,093
Net realized gain on sale of investments 4,211 7,024
Investment Income Before Fair Value Adjustment 46,227 36,117
Fair value adjustment, due to net unrealized gain (loss), on equity securities held at end of period 314,348 (25,782)
Net loss (gain) on sale of equity securities previously recognized through fair value adjustment 6,612 (6,197)
Investment Income $ 367,187 $ 4,138