v3.26.1
Fair Value Option (Gains And Losses Due To Changes In Fair Value Of Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]        
Gains due to changes in fair value of investments $ 52,672 $ 10,940 $ 34,754 $ 2,065
Investments        
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]        
Gains due to changes in fair value of investments 52,728 10,823 34,877 1,465
Fixed maturity securities        
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]        
Gains due to changes in fair value of investments 21,393 (8,423) 5,917 8,984
Equity securities        
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]        
Gains due to changes in fair value of investments 31,347 19,253 28,955 (7,509)
Short-term investments        
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]        
Gains due to changes in fair value of investments (12) (7) 5 (10)
Notes receivable        
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]        
Gains due to changes in fair value of investments $ (56) $ 117 $ (123) $ 600