Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2,916	$ (1,213)
Other comprehensive income:
Foreign currency translation adjustments, net of tax	950	318
Comprehensive income (loss)	$ 3,866	$ (895)