Compensation Programs (Schedule Of Dividend Equivalent Rights) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Total Grant	0	0
Related compensation costs	$ 251,000	$ 209,000
2008 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant	July 2008
Total Grant	225,000
Related compensation costs	97,000	92,000
2009 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant	July 2009
Total Grant	225,000
Related compensation costs	97,000	92,000
2010 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant	July 2010
Total Grant	60,000
Related compensation costs	26,000	25,000
2011 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant	August 2011
Total Grant	72,000
Related compensation costs	$ 31,000