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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 188,124	$ 148,243	$ 333,821	$ 293,190
Funds held interest income (expense)	1,422	1,939	7,390	5,569
Future policy benefit reserve income (expense)	(359)	(359)	(593)	(568)
Gross investment income	189,187	149,823	340,618	298,191
Investment expenses	(10,159)	(8,501)	(20,614)	(18,575)
Net investment income	179,028	141,322	320,004	279,616
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	126,593	114,824	253,301	223,506
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	4,596	6,672	8,103	13,499
Short Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	5,393	2,092	9,598	3,824
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	48,243	21,996	56,540	45,377
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 3,299	$ 2,659	$ 6,279	$ 6,984

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