Stockholders' Equity (Schedule Of Teasury Stock) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			48 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2012
Stockholders' Equity [Abstract]
Shares	33,856	53,879	447,400	535,135
Weighted average price per share	$ 18.44	$ 19.27	$ 18.58	$ 18.64
Cost	$ 626	$ 1,041	$ 8,333	$ 10,000