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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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (832,237)	$ 97,127	$ (1,759,644)	$ (235,581)
Deferred tax benefit (expense)	115,714	(11,366)	232,123	29,061
Total URA(D) on securities arising during the period	(716,523)	85,761	(1,527,521)	(206,520)
Fixed Maturity Securities and Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (832,237)	$ 97,127	$ (1,759,644)	$ (235,581)

X

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

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