Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 5,971	$ (767)	$ 16,665	$ 5,771
Other comprehensive income (loss):
Foreign currency translation adjustments	285	750	(533)	1,066
Total other comprehensive income (loss)	285	750	(533)	1,066
Comprehensive income (loss)	$ 6,256	$ (17)	$ 16,132	$ 6,837