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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 307,685	$ 244,520	$ 992,320	$ 444,688
Funds held interest income (expense)	1,196	684	12,449	10,921
Future policy benefit reserve income (expense)	(272)	(291)	(733)	(805)
Gross investment income	308,609	244,913	1,004,036	454,804
Investment expenses	(15,850)	(10,680)	(43,769)	(34,688)
Net investment income	292,759	234,233	960,267	420,116
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	134,157	136,104	423,335	407,946
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	3,774	4,402	12,105	11,585
Short Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	82	494	1,035	4,356
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	138,718	88,778	493,017	22,092
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 30,954	$ 14,742	$ 62,828	$ (1,291)

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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
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