v3.26.1
Investments (Summary Of Net Investment Gains (Losses) And The Change In Net Unrealized Gains On Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Gain (Loss) on Securities [Line Items]    
Net realized investment gains (losses) $ 2,043 $ (1,801)
Change in fair value of securities sold during the period (1,620) (1,322)
Change in fair value of securities held at the end of the period (727,985) (145,948)
Total change in fair value of equity securities (729,605) (147,270)
Net investment gains (losses) (727,562) (149,071)
Change in net unrealized losses on available-for-sale investments included in other comprehensive income (loss): (170,551) 277,227
Fixed Maturity Securities [Member]    
Gain (Loss) on Securities [Line Items]    
Change in net unrealized losses on available-for-sale investments included in other comprehensive income (loss): (165,604) 273,213
Short-term investments [Member]    
Gain (Loss) on Securities [Line Items]    
Change in net unrealized losses on available-for-sale investments included in other comprehensive income (loss): $ (4,947) $ 4,014