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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items] |  |  |
Deferred tax benefit (expense) | $ (176,007) | $ (80,150) | $ 299,095
Total URA(D) on securities arising during the period | 419,734 | 483,817 | $ (228,160)
Amortized Cost [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Change in unrealized appreciation (depreciation), pre-tax | 465,192 | 532,851 |
Deferred tax benefit (expense) | (45,458) | (49,149) |
Deferred tax benefit (expense), other-than-temporary impairment |  | 115 |
Total URA(D) on securities arising during the period | 419,734 | 483,817 |
Amortized Cost [Member] | Fixed Maturity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Change in unrealized appreciation (depreciation), pre-tax | 465,192 | 534,410 |
Amortized Cost [Member] | Fixed Maturity Securities, Other-Than-Temporary Impairment [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Change in unrealized appreciation (depreciation), pre-tax |  | $ (1,559) |

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