Other Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Income and Expenses [Abstract]
Foreign currency gains (losses)	$ 89	$ 414	$ (198)	$ 554
Tax indemnification income	692	489	2,220	1,469
Other	18	5	33	14
Total other income	$ 799	$ 908	$ 2,055	$ 2,037