Goodwill Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill Roll Forward
Goodwill, Beginning Balance	$ 86,034	$ 80,804
Goodwill Additions	0	1,832
Goodwill, Translation Adjustments	(2,701)	3,398
Goodwill, Ending Balance	83,333	86,034
North America [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	47,571	45,490
Goodwill Additions	0	1,832
Goodwill, Translation Adjustments	(268)	249
Goodwill, Ending Balance	47,303	47,571
EMEA [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	20,504	18,189
Goodwill Additions	0
Goodwill Reductions		0
Goodwill, Translation Adjustments	(1,169)	2,315
Goodwill, Ending Balance	19,335	20,504
Asia Pacific [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	15,456	14,566
Goodwill Additions	0	0
Goodwill, Translation Adjustments	(869)	890
Goodwill, Ending Balance	14,587	15,456
South America [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	2,503	2,559
Goodwill Additions	0	0
Goodwill, Translation Adjustments	(395)	(56)
Goodwill, Ending Balance	$ 2,108	$ 2,503