Goodwill Assets (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 86,034
Goodwill, Translation Adjustments	(1,804)
Goodwill, Ending Balance	84,230
North America [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	47,571
Goodwill, Translation Adjustments	(166)
Goodwill, Ending Balance	47,405
EMEA [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	20,504
Goodwill, Translation Adjustments	(837)
Goodwill, Ending Balance	19,667
Asia Pacific [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	15,456
Goodwill, Translation Adjustments	(418)
Goodwill, Ending Balance	15,038
South America [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	2,503
Goodwill, Translation Adjustments	(383)
Goodwill, Ending Balance	$ 2,120