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Investments (Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]      
Deferred tax benefit (expense) $ (176,007) $ (80,150) $ 299,095
Total URA(D) on securities arising during the period 419,734 483,817 $ (228,160)
Amortized Cost [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Change in unrealized appreciation (depreciation), pre-tax 465,192 532,851  
Deferred tax benefit (expense) (45,458) (49,149)  
Deferred tax benefit (expense), other-than-temporary impairment 115  
Total URA(D) on securities arising during the period 419,734 483,817  
Amortized Cost [Member] | Fixed Maturity Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Change in unrealized appreciation (depreciation), pre-tax 465,192 534,410  
Amortized Cost [Member] | Fixed Maturity Securities, Other-Than-Temporary Impairment [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Change in unrealized appreciation (depreciation), pre-tax $ (1,559)