Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended					12 Months Ended
	Dec. 31, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Currency translation adjustment	Dec. 31, 2010 Currency translation adjustment	Dec. 31, 2011 Unrealized holding gain on securities, available-for-sale	Dec. 31, 2010 Unrealized holding gain on securities, available-for-sale
Before Tax Effects		$ 8,341	$ 10,551	$ 8,341	$ 10,407	$ 144	$ 144
Tax Effects			(58)			(58)	(58)
After Tax Effects		8,341	10,493	8,341	10,407	86	86
Less: Reclassification adjustment for gains recognized in net income, before tax effects						(144)
Less: Reclassification adjustment for gains recognized in net income, tax effects						58
Less: Reclassification adjustment for gains recognized in net income, after tax effects	$ 269					$ (86)