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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, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Deferred tax benefit (expense)	$ (40,624)	$ (176,007)	$ (80,150)
Total URA(D) on securities arising during the period	(484,762)	419,734	$ 483,817
Amortized Cost [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	(542,343)	465,192
Deferred tax benefit (expense)	57,581	(45,458)
Total URA(D) on securities arising during the period	(484,762)	419,734
Amortized Cost [Member] | Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (542,343)	$ 465,192

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

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