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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 677,347	$ 615,802	$ 559,773
Funds held interest income (expense)	13,271	6,300	11,874
Future policy benefit reserve income (expense)	(1,380)	(1,419)	(1,282)
Gross investment income	689,238	620,683	570,365
Investment expenses	(42,099)	(39,500)	(27,467)
Net investment income	647,139	581,183	542,898
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	520,291	465,793	427,379
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	19,505	25,327	34,523
Short Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	17,619	14,395	4,177
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	105,815	93,327	83,569
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 14,117	$ 16,960	$ 10,125

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