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Investments (Gains And Losses Due To Changes In Fair Value Of Investments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fixed maturity securities |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |
Total gains | $ (260,223) | $ (39,649) | $ 41,394
Equity securities |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |
Total gains | (185,694) | 107,701 | 32,232
Short-term investments |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |
Total gains | 88 | (141) | (1,014)
Investments |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |
Total gains | $ (445,829) | $ 67,911 | $ 72,612

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