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Investments (Net Investment Gains (Losses) and Change in Net Unrealized Gains On Available-For-Sale Investments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Gain (Loss) on Securities [Line Items]      
Net realized investment gains (losses) $ (42,177) $ (40,983) $ 37,908
Change in fair value of equity securities sold during the period 34,684 (14,884) 25,902
Change in fair value of equity securities held at the end of the period 1,531,547 (1,539,866) 1,914,724
Change in fair value of equity securities 1,566,231 (1,554,750) 1,940,626
Net investment gains (losses) 1,524,054 (1,595,733) 1,978,534
Change in net unrealized gains on investments included in other comprehensive income (loss) 390,558 (1,463,876) (513,084)
Fixed maturities [Member]      
Gain (Loss) on Securities [Line Items]      
Change in net unrealized gains on investments included in other comprehensive income (loss) 389,498 (1,474,890) (504,133)
Short-term investments [Member]      
Gain (Loss) on Securities [Line Items]      
Change in net unrealized gains on investments included in other comprehensive income (loss) $ 1,060 $ 11,014 $ (8,951)