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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
	Mar. 31, 2022	Mar. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (927,407)	$ (322,708)
Deferred tax benefit (expense)	116,408	40,427
Total URA(D) on securities arising during the period	(810,999)	(292,281)
Fixed Maturity Securities and Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (927,407)	$ (322,708)

X

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

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