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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 189,229	$ 171,220	$ 523,050	$ 464,410
Funds held interest income (expense)	2,325	1,003	9,715	6,572
Future policy benefit reserve income (expense)	(372)	(431)	(965)	(999)
Gross investment income	191,182	171,792	531,800	469,983
Investment expenses	(10,124)	(10,429)	(30,738)	(29,004)
Net investment income	181,058	161,363	501,062	440,979
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	130,139	119,513	383,440	343,019
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	4,147	5,380	12,250	18,879
Short Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	3,899	5,005	13,497	8,829
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	43,758	38,342	100,298	83,719
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 7,286	$ 2,980	$ 13,565	$ 9,964

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