Investments (Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities	$ 1,725,917	$ 1,848,268	$ 1,113,960
Gross gains from sales	47,899	37,427	38,141
Gross losses from sales	(70,185)	(36,156)	(31,148)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities	642,980	600,970	751,973
Gross gains from sales	27,675	20,900	44,703
Gross losses from sales	$ (41,682)	$ (20,318)	$ (9,308)