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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 252,799	$ 266,286
Funds held interest income (expense)	3,685	7,966
Future policy benefit reserve income (expense)	(222)	(291)
Gross investment income	256,262	273,961
Investment expenses	(13,432)	(13,548)
Net investment income	242,830	260,413
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	148,226	140,916
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	4,146	4,838
Short Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	159	180
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	88,437	114,333
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 11,831	$ 6,019

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