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Fair Value Measurements (Summary Of Changes In Level 3 Investments Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities, beginning of period $ 936 $ 4,380 $ 899 $ 56,472
Purchases 0 0 0 0
Sales 0 (3,528) 0 (56,335)
Net investment gains 6 69 43 784
Equity securities, end of period $ 942 $ 921 $ 942 $ 921