Segment Information (Schedule Of Interest Income, By Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule Of Interest Income By Major Geographic Areas [Line Items]
Interest income	$ 1,319	$ 1,391	$ 1,629
Americas [Member]
Schedule Of Interest Income By Major Geographic Areas [Line Items]
Interest income	408	588	803
Europe [Member]
Schedule Of Interest Income By Major Geographic Areas [Line Items]
Interest income	771	699	727
Asia Pacific [Member]
Schedule Of Interest Income By Major Geographic Areas [Line Items]
Interest income	$ 140	$ 104	$ 99