v3.26.3
Investments (Summary Of Net Investment Gains (Losses) And The Change In Net Unrealized Gains On Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Gain (Loss) on Securities [Line Items]        
Net realized investment gains (losses) $ (523) $ 4,695 $ (1,413) $ (13,702)
Change in fair value of securities sold during the period (177) (1,795) 20,750 1,345
Change in fair value of securities held at the end of the period (280,209) 429,986 139,717 876,395
Total change in fair value of equity securities (280,386) 428,191 160,467 877,740
Net investment gains (losses) (280,909) 432,886 159,054 864,038
Change in net unrealized losses on available-for-sale investments included in other comprehensive income (loss): (550,416) 59,823 (796,237) 595,379
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): (551,827) 60,844 (789,895) 585,862
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): $ 1,411 $ (1,021) $ (6,342) $ 9,517