Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 119,733	$ 148,997	$ 379,196	$ 415,063
Funds held interest income (expense)	2,569	1,817	8,162	6,875
Future policy benefit reserve income (expense)	(300)	(471)	(1,402)	(915)
Gross investment income	122,002	150,343	385,956	421,023
Investment expenses	(6,491)	(8,200)	(22,816)	(24,499)
Net investment income	115,511	142,143	363,140	396,524
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	108,134	115,057	326,970	348,872
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	11,090	11,086	35,783	36,111
Short-Term Investments And Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	381	295	1,084	1,202
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	370	21,690	13,993	25,658
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ (242)	$ 869	$ 1,366	$ 3,220