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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Change in unrealized appreciation (depreciation), pre-tax | $ 614,077 | $ 225,767 | $ 337,053 | $ 479,417
Deferred tax benefit (expense) | (69,581) | (29,954) | (40,557) | (52,431)
Deferred tax benefit (expense), other-than-temporary impairment |  | 77 |  | 147
Total URA(D) on securities arising during the period | 544,496 | 195,890 | 296,496 | 427,133
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Change in unrealized appreciation (depreciation), pre-tax | 614,077 | 227,266 | 337,053 | 481,160
Fixed Maturity Securities, Other-Than-Temporary Impairment [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Change in unrealized appreciation (depreciation), pre-tax |  | $ (1,499) |  | $ (1,743)

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