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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