v3.25.1
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, 2025
Mar. 31, 2024
Gain (Loss) on Securities [Line Items]    
Net realized investment losses $ (1,801) $ (4,488)
Change in fair value of securities sold during the period (1,322) 43
Change in fair value of securities held at the end of the period (145,948) 906,726
Total change in fair value of equity securities (147,270) 906,769
Net investment gains (losses) (149,071) 902,281
Change in net unrealized losses on available-for-sale investments included in other comprehensive income (loss): 277,227 (155,769)
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): 273,213 (148,487)
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): $ 4,014 $ (7,282)