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Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 2,783 |
Due after one year through five years | 71,423 |
Due after five years through ten years | 480,331 |
Due after ten years | 1,018,159 |
Total | 1,572,696 | $ 1,673,864
Estimated Fair Value |  |
Due in one year or less | 2,686 |
Due after one year through five years | 66,477 |
Due after five years through ten years | 429,944 |
Due after ten years | 859,112 |
Total | $ 1,358,219 | $ 1,505,520

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