Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 6,133	$ 3,243
Foreign currency translation gain (loss)	1,856	(3,099)
Unrealized gain on investments	64	8
Other comprehensive income (loss)	1,920	(3,091)
Comprehensive income	$ 8,053	$ 152