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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 680,703	$ 677,347	$ 615,802
Funds held interest income (expense)	12,754	13,271	6,300
Future policy benefit reserve income (expense)	(1,237)	(1,380)	(1,419)
Gross investment income	692,220	689,238	620,683
Investment expenses	(49,755)	(42,099)	(39,500)
Net investment income	642,465	647,139	581,183
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	542,363	520,291	465,793
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	18,776	19,505	25,327
Short Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	5,012	17,619	14,395
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	112,853	105,815	93,327
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 1,699	$ 14,117	$ 16,960

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