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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Change in unrealized appreciation (depreciation), pre-tax | $ (832,237) | $ 97,127 | $ (1,759,644) | $ (235,581)
Deferred tax benefit (expense) | 115,714 | (11,366) | 232,123 | 29,061
Total URA(D) on securities arising during the period | (716,523) | 85,761 | (1,527,521) | (206,520)
Fixed Maturity Securities and Short-Term Investments [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Change in unrealized appreciation (depreciation), pre-tax | $ (832,237) | $ 97,127 | $ (1,759,644) | $ (235,581)

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