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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]        
Gains (losses) due to changes in fair value of investments $ (20,363) $ (35,360) $ 4,580 $ 7,689
Investments        
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]        
Gains (losses) due to changes in fair value of investments (20,349) (35,485) 4,751 7,564
Fixed maturity securities        
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]        
Gains (losses) due to changes in fair value of investments (1,722) (22,835) (11,016) 16,940
Equity securities        
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]        
Gains (losses) due to changes in fair value of investments (18,693) (12,608) 15,805 (9,368)
Short-term investments        
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]        
Gains (losses) due to changes in fair value of investments 66 (42) (38) (8)
Note receivable        
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]        
Gains (losses) due to changes in fair value of investments $ (14) $ 125 $ (171) $ 125