Restructuring Expenses (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Position	Dec. 31, 2017 USD ($)
Restructuring Expenses [Abstract]
Number of positions eliminated | Position	40
Cumulative translation adjustment	$ 1,600
Tax benefit	1,000
Restructuring and Related Cost, Expected Cost [Abstract]
Termination Costs for the Year	1,269
Accumulated Termination Costs	2,002
Expected Costs Remaining	159
Total Expected Termination Costs	2,161
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	465
Accruals	1,223
Payments	(1,586)	$ 0
Currency translation and other adjustments	(16)
Restructuring Reserve, Ending Balance	86	465
Employee Termination Benefits [Member]
Restructuring and Related Cost, Expected Cost [Abstract]
Termination Costs for the Year	355
Accumulated Termination Costs	820
Expected Costs Remaining	0
Total Expected Termination Costs	820
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	465
Accruals	341
Payments	(737)
Currency translation and other adjustments	(17)
Restructuring Reserve, Ending Balance	52	465
Lease Termination Costs [Member]
Restructuring and Related Cost, Expected Cost [Abstract]
Termination Costs for the Year	700
Accumulated Termination Costs	700
Expected Costs Remaining	0
Total Expected Termination Costs	700
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	0
Accruals	668
Payments	(635)
Currency translation and other adjustments	1
Restructuring Reserve, Ending Balance	34	0
Assets Write-off [Member]
Restructuring and Related Cost, Expected Cost [Abstract]
Termination Costs for the Year	0
Accumulated Termination Costs	222
Expected Costs Remaining	0
Total Expected Termination Costs	222
Other Restructuring Costs [Member]
Restructuring and Related Cost, Expected Cost [Abstract]
Termination Costs for the Year	214
Accumulated Termination Costs	260
Expected Costs Remaining	159
Total Expected Termination Costs	419
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	0
Accruals	214
Payments	(214)
Currency translation and other adjustments	0
Restructuring Reserve, Ending Balance	$ 0	$ 0