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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 | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities, beginning of period | $ 853 | $ 8,468 | $ 899 | $ 56,472
Purchases | 0 | 0 | 0 | 0
Sales | 0 | (4,027) | 0 | (52,807)
Net investment gains (losses) | 83 | (61) | 37 | 715
Equity securities, end of period | $ 936 | $ 4,380 | $ 936 | $ 4,380

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