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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 241,531	$ 418,349	$ 494,330	$ 684,635
Funds held interest income (expense)	772	3,287	4,457	11,253
Future policy benefit reserve income (expense)	(128)	(170)	(350)	(461)
Gross investment income	242,175	421,466	498,437	695,427
Investment expenses	(16,197)	(14,371)	(29,629)	(27,919)
Net investment income	225,978	407,095	468,808	667,508
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	168,769	148,262	316,995	289,178
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	4,600	3,493	8,746	8,331
Short Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	6,587	773	6,746	953
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	47,584	239,966	136,021	354,299
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 13,991	$ 25,855	$ 25,822	$ 31,874

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