CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ 8,247	$ 5,542	$ 16,273
Other comprehensive income (loss), net of tax:
Foreign currency translation gain (loss)	3,952	(5,781)
Net unrealized gain (loss) on available-for-sale securities	3,510	(3,278)	1,585
Reclassification adjustment for net realized gains on available-for-sale securities recognized in net income	(2,567)
Other comprehensive income (loss), net of tax	4,895	(9,059)	1,585
Comprehensive income (loss)	$ 13,142	$ (3,517)	$ 17,858