Conslidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]
Net income (loss)	$ 2,689	$ (4,584)
Other comprehensive income (loss):
Foreign currency translation adjustments	(2,289)	811
Change in unrealized gains on available-for-sale securities, net of tax of $(212) and $38, respectively	(339)	60
Total other comprehensive income (loss)	(2,628)	871
Comprehensive income (loss)	$ 61	$ (3,713)