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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 266,286	$ 152,117
Funds held interest income (expense)	7,966	8,216
Future policy benefit reserve income (expense)	(291)	(211)
Gross investment income	273,961	160,122
Investment expenses	(13,548)	(12,322)
Net investment income	260,413	147,800
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	140,916	137,924
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	4,838	3,521
Short Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	180	2,175
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	114,333	21,568
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 6,019	$ (13,071)

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