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		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 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	$ 55	$ 110
Share Equivalent Units	1,237	2,142	2,218	3,517