CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 1,881	$ (4,651)	$ (285)	$ (6,473)
Other comprehensive loss:
Unrealized gain on available-for-sale securities				964
Reclassification of unrealized gain to a realized gain on available-for-sale securities				(1,557)
Foreign currency translation adjustments	(9,417)	(5,078)	(19,873)	(1,635)
Total other comprehensive loss	(9,417)	(5,078)	(19,873)	(2,228)
Comprehensive loss	$ (7,536)	$ (9,729)	$ (20,158)	$ (8,701)