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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Change in unrealized appreciation (depreciation), pre-tax | $ 97,127 | $ 614,077 | $ (235,581) | $ 337,053
Deferred tax benefit (expense) | (11,366) | (69,581) | 29,061 | (40,557)
Total URA(D) on securities arising during the period | 85,761 | 544,496 | (206,520) | 296,496
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Change in unrealized appreciation (depreciation), pre-tax | $ 97,127 | $ 614,077 | $ (235,581) | $ 337,053

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