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) |