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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
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Fair Value Disclosures [Abstract]    
Equity securities, beginning of period $ 899 $ 56,472
Purchases 0 0
Sales 0 (56,335)
Net investment gains (losses) on Level 3 investments 95 762
Equity securities, end of period $ 994 $ 899
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net investment gains (losses) Net investment gains (losses)