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Investments (Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items] |  |  |
Deferred tax benefit (expense) | $ (40,624) | $ (176,007) | $ (80,150)
Total URA(D) on securities arising during the period | (484,762) | 419,734 | $ 483,817
Amortized Cost [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Change in unrealized appreciation (depreciation), pre-tax | (542,343) | 465,192 |
Deferred tax benefit (expense) | 57,581 | (45,458) |
Total URA(D) on securities arising during the period | (484,762) | 419,734 |
Amortized Cost [Member] | Fixed Maturity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Change in unrealized appreciation (depreciation), pre-tax | $ (542,343) | $ 465,192 |

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