Investments (Summary Of Other-Than-Temporary Impairment Losses Recognized In Net Income And In Net Realized Investment Gains (Losses) By Investment Type) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairment losses recognized in net income	$ (3,159)	$ (9,984)	$ (4,151)	$ (14,859)
Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairment losses recognized in net income	0	(1,473)	0	(6,348)
Fixed Maturities [Member] | Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairment losses recognized in net income	0	(1,473)	0	(6,348)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairment losses recognized in net income	(3,159)	(8,511)	(4,151)	(8,511)
Equity Securities [Member] | Insurance Companies, Banks And Trusts [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairment losses recognized in net income	(1,615)	(4,048)	(2,441)	(4,048)
Equity Securities [Member] | Industrial, Consumer And All Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairment losses recognized in net income	$ (1,544)	$ (4,463)	$ (1,710)	$ (4,463)