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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 145,697	$ 144,947
Funds held interest income (expense)	5,968	3,630
Future policy benefit reserve income (expense)	(234)	(209)
Gross investment income	151,431	148,368
Investment expenses	(10,455)	(10,074)
Net investment income	140,976	138,294
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	126,708	108,682
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	3,507	6,827
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	8,297	23,381
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 2,980	$ 4,325

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