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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 152,117	$ 145,697
Funds held interest income (expense)	8,216	5,968
Future policy benefit reserve income (expense)	(211)	(234)
Gross investment income	160,122	151,431
Investment expenses	(12,322)	(10,455)
Net investment income	147,800	140,976
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	137,924	126,708
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	3,521	3,507
Short Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	2,175	4,205
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	21,568	8,297
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ (13,071)	$ 2,980

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