Business Segments And Geographic Area Information (Summary Of Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Total Assets	$ 428,588	$ 430,764	$ 430,349
Segment [Member]
Segment Reporting Information [Line Items]
Total Assets	408,667	414,608	406,569
Corporate [Member]
Segment Reporting Information [Line Items]
Total Assets	$ 19,921	$ 16,156	$ 23,780