Compensation Programs (Schedule Of Dividend Equivalent Rights) (Details) (USD $) In Thousands, except Share data	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2011	Dec. 31, 2010	Dec. 31, 2009
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Total Grants		0	0	30,000
Related compensation costs	$ 256,000	$ 710,000
2008 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant		July 2008
Total Grants		225,000
Related compensation costs	99,000	299,000
2009 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant		July 2009
Total Grants		225,000
Related compensation costs	99,000	299,000
2010 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant		July 2010
Total Grants		60,000
Related compensation costs	26,000	80,000
2011 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant		August 2011
Total Grants		72,000
Related compensation costs	$ 32,000	$ 32,000