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Investments (Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturities By Contractual Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Due in one year or less, amortized cost | $ 1,192,021 |
Due after one year through five years, amortized cost | 5,033,324 |
Due after five years through ten years, amortized cost | 4,320,467 |
Due after ten years, amortized cost | 1,523,119 |
Amortized cost, sub-total | 12,068,931 |
Fixed maturities, amortized cost | 14,932,286 | $ 12,805,887
Due in one year or less, estimated fair value | 1,179,344 |
Due after one year through five years, estimated fair value | 4,917,770 |
Due after five years through ten years, estimated fair value | 4,159,846 |
Due after ten years, estimated fair value | 1,401,692 |
Estimated fair value, sub-total | 11,658,652 |
Available-for-sale fixed maturity investments, estimated fair value | 14,372,732 | 11,856,835
Commercial mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,371,406 |
Fixed maturities, amortized cost | 2,371,406 | 2,109,721
Estimated fair value | 2,243,658 |
Available-for-sale fixed maturity investments, estimated fair value | 2,243,658 | 1,940,448
Residential mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 491,949 |
Fixed maturities, amortized cost | 491,949 | 553,591
Estimated fair value | 470,422 |
Available-for-sale fixed maturity investments, estimated fair value | $ 470,422 | $ 526,793

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