Investments (Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments) (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]
Change in unrealized appreciation (depreciation), pre-tax	$ (76,374)	$ (91,407)	$ (86,957)	$ 73,157
Deferred tax benefit (expense)	9,919	11,649	5,563	(9,480)
Deferred tax benefit (expense), other-than-temporary impairment	(8)		(3,415)
Total URA(D) on securities arising during the period	(66,463)	(79,758)	(84,809)	63,677
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	(71,706)	(87,859)	(89,616)	70,010
Fixed Maturity Securities, Other-Than-Temporary Impairment [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	(253)	(261)	8,954	(180)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (4,415)	$ (3,287)	$ (6,295)	$ 3,327