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Investments (Summary Of Net Investment Gains (Losses) And The Change In Net Unrealized Gains On Investments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Gain (Loss) on Securities [Line Items]        
Net realized investment gains (losses) $ 1,155 $ (2,259) $ (2,066) $ 3,969
Equity securities, Change in fair value of securities sold during the period 2,434 (2,113) 13,487 (19,231)
Equity securities, Change in fair value of securities held at the end of the period 480,938 (1,550,271) 845,669 (1,897,780)
Total change in fair value of equity securities 483,372 (1,552,384) 859,156 (1,917,011)
Net investment gains (losses) 484,527 (1,554,643) 857,090 (1,913,042)
Change in net unrealized gains (losses) on available-for-sale investments included in other comprehensive income (loss): (170,570) (458,328) 37,799 (1,118,276)
Fixed Maturities [Member]        
Gain (Loss) on Securities [Line Items]        
Change in net unrealized gains (losses) on available-for-sale investments included in other comprehensive income (loss): (167,992) (449,089) 41,187 (1,114,899)
Short-term investments [Member]        
Gain (Loss) on Securities [Line Items]        
Change in net unrealized gains (losses) on available-for-sale investments included in other comprehensive income (loss): $ (2,578) $ (9,239) $ (3,388) $ (3,377)