Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 130,590	$ 138,261	$ 259,463	$ 266,066
Funds held interest income (expense)	2,717	2,041	5,593	5,058
Future policy benefit reserve income (expense)	(709)	(141)	(1,102)	(444)
Gross investment income	132,598	140,161	263,954	270,680
Investment expenses	(7,552)	(8,937)	(16,325)	(16,299)
Net investment income	125,046	131,224	247,629	254,381
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	109,481	117,562	218,836	233,815
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	13,015	13,566	24,693	25,025
Short-Term Investments And Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	456	577	703	907
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	6,655	6,226	13,623	3,968
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 983	$ 330	$ 1,608	$ 2,351