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Investments (Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturity Securities By Contractual Maturity Date) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Due in one year or less, amortized cost | $ 1,193,540 |
Due after one year through five years, amortized cost | 4,544,954 |
Due after five years through ten years, amortized cost | 3,382,145 |
Due after ten years, amortized cost | 1,771,463 |
Amortized cost, sub-total | 10,892,102 |
Total fixed maturities, amortized cost | 13,653,557 | $ 12,805,887
Due in one year or less, estimated fair value | 1,170,094 |
Due after one year through five years, estimated fair value | 4,325,414 |
Due after five years through ten years, estimated fair value | 3,077,695 |
Due after ten years, estimated fair value | 1,617,807 |
Estimated fair value, sub-total | 10,191,010 |
Total fixed maturities, estimated fair value | 12,745,692 | 11,856,835
Commercial mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, amortized cost | 2,251,522 |
Total fixed maturities, amortized cost | 2,251,522 | 2,109,721
Fixed maturities, estimated fair value | 2,073,556 |
Total fixed maturities, estimated fair value | 2,073,556 | 1,940,448
Residential mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, amortized cost | 508,692 |
Total fixed maturities, amortized cost | 508,692 | 553,591
Fixed maturities, estimated fair value | 479,922 |
Total fixed maturities, estimated fair value | 479,922 | 526,793
Asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, amortized cost | 1,241 |
Total fixed maturities, amortized cost | 1,241 | 1,693
Fixed maturities, estimated fair value | 1,204 |
Total fixed maturities, estimated fair value | $ 1,204 | $ 1,640

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