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Investments (Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Schedule of Available-for-sale Securities [Line Items] |  |
Change in unrealized appreciation (depreciation), pre-tax | $ (332,708) | $ (277,023)
Deferred tax benefit (expense) | 40,427 | 29,024
Change in unrealized appreciation (depreciation), net of deferred taxes, included in shareholders' equity | (292,281) | (247,999)
Fixed Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Change in unrealized appreciation (depreciation), pre-tax | $ (332,708) | $ (277,023)

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