Accounting for Stock-Based Compensation (Schedule of Director's Fees Deferral Plan, Activity) (Details) (Directors' Fees Deferral Plan [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Directors' Fees Deferral Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Directors' Fees Earned and Deferred into Plan	$ 28	$ 55	$ 83	$ 165
Share Equivalent Units	944	3,305	3,161	6,822