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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ 97,127	$ 614,077	$ (235,581)	$ 337,053
Deferred tax benefit (expense)	(11,366)	(69,581)	29,061	(40,557)
Total URA(D) on securities arising during the period	85,761	544,496	(206,520)	296,496
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ 97,127	$ 614,077	$ (235,581)	$ 337,053

X

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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