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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Change in unrealized appreciation (depreciation), pre-tax | $ 225,767 | $ (40,465) | $ 479,417 | $ (260,139)
Deferred tax benefit (expense) | (29,954) | (1,007) | (52,431) | 19,292
Deferred tax benefit (expense), other-than-temporary impairment | 77 | (55) | 147 | (76)
Total URA(D) on securities arising during the period | 195,890 | (41,527) | 427,133 | (240,923)
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Change in unrealized appreciation (depreciation), pre-tax | 227,266 | (40,921) | 481,160 | (260,406)
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) | $ 456 | $ (1,743) | $ 267

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