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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Change in unrealized appreciation (depreciation), pre-tax | $ 103,245 | $ (22,001) | $ 582,662 | $ (282,140)
Deferred tax benefit (expense) | (9,984) | 1,205 | (62,415) | 20,497
Deferred tax benefit (expense), other-than-temporary impairment | (25) | (69) | 122 | (145)
Total URA(D) on securities arising during the period | 93,236 | (20,865) | 520,369 | (261,788)
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Change in unrealized appreciation (depreciation), pre-tax | 103,173 | (22,073) | 584,333 | (282,479)
Fixed Maturity Securities, Other-Than-Temporary Impairment [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Change in unrealized appreciation (depreciation), pre-tax | $ 72 | $ 72 | $ (1,671) | $ 339

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