CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 7,695	$ 4,511	$ 13,306	$ 10,265
Other comprehensive income (loss):
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	2,581	(2,704)	7,177	(8,903)
Unrealized gain (loss) on marketable securities, net of tax	339	(374)	634	(745)
Total comprehensive income	$ 10,615	$ 1,433	$ 21,117	$ 617