Other Comprehensive Income (Details) (USD $)	3 Months Ended	6 Months Ended
	Mar. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Other Comprehensive Income
Unrealized holding gain/(loss) on securities, available-for-sale			$ 86,000
Total		14,549,000	10,493,000
Available-for-sale securities
Gross proceeds from the sale of available-for-sale securities	2,100,000
Pre-tax gain on the sale of available-for-sale securities		500,000
Before Tax Effects
Other Comprehensive Income
Currency translation adjustment		14,549,000	10,407,000
Unrealized holding gain/(loss) on securities, available-for-sale		144,000	144,000
Less: Reclassification adjustment for gains recognized in net income		(144,000)
Total		14,549,000	10,551,000
Tax Effects
Other Comprehensive Income
Unrealized holding gain/(loss) on securities, available-for-sale		(58,000)	(58,000)
Less: Reclassification adjustment for gains recognized in net income		58,000
Total			(58,000)
After Tax Effects
Other Comprehensive Income
Currency translation adjustment		14,549,000	10,407,000
Unrealized holding gain/(loss) on securities, available-for-sale		86,000	86,000
Less: Reclassification adjustment for gains recognized in net income		(86,000)
Total		$ 14,549,000	$ 10,493,000