Investments (Credit Loss Component Of OTTI On Debt Securities Recognized In Earnings) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Beginning Balance	$ 26,658	$ 26,023
Additional credit impairment	304	1,273
Called		(638)
Sold	(786)
Ending Balance	26,176	26,658
Debt Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Beginning Balance	20,610	20,893
Additional credit impairment	304	355
Called		(638)
Ending Balance	20,914	20,610
Equity Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Beginning Balance	6,048	5,130
Additional credit impairment		918
Sold	(786)
Ending Balance	$ 5,262	$ 6,048