Investments (Summary Of Activity For Credit Losses Recognized ) (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
Investments [Abstract]
Cumulative credit loss, beginning balance	$ 21,370	$ 15,167	$ 21,370	$ 10,307
Other-than-temporary impairment losses not previously recognized	0	875	0	875
Increases related to other-than-temporary impairment losses previously recognized	0	598	0	5,473
Total additions	0	1,473	0	6,348
Sales of fixed maturities on which credit losses were recognized	0	0	0	(15)
Cumulative credit loss, ending balance	$ 21,370	$ 16,640	$ 21,370	$ 16,640