Restructuring Activities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Position	Mar. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated | Position	40
Restructuring and Related Cost, Expected Cost [Abstract]
Restructuring and Related Cost, Cost Incurred to Date	$ 1,650
Restructuring and Related Cost, Expected Cost Remaining	135
Restructuring and Related Cost, Expected Cost, Total	1,785
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	498
Restructuring charges	917	$ 45
Payments for Restructuring	(411)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	120
Restructuring Reserve, Ending Balance	1,124
Employee Severance [Member]
Restructuring and Related Cost, Expected Cost [Abstract]
Restructuring and Related Cost, Cost Incurred to Date	729
Restructuring and Related Cost, Expected Cost Remaining	7
Restructuring and Related Cost, Expected Cost, Total	736
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	465
Restructuring charges	264
Payments for Restructuring	(406)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	1
Restructuring Reserve, Ending Balance	324
Contract Termination [Member]
Restructuring and Related Cost, Expected Cost [Abstract]
Restructuring and Related Cost, Cost Incurred to Date	519
Restructuring and Related Cost, Expected Cost Remaining	36
Restructuring and Related Cost, Expected Cost, Total	555
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	0
Restructuring charges	519
Payments for Restructuring	0
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	119
Restructuring Reserve, Ending Balance	638
Other Restructuring [Member]
Restructuring and Related Cost, Expected Cost [Abstract]
Restructuring and Related Cost, Cost Incurred to Date	180
Restructuring and Related Cost, Expected Cost Remaining	92
Restructuring and Related Cost, Expected Cost, Total	272
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	33
Restructuring charges	134
Payments for Restructuring	(5)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	0
Restructuring Reserve, Ending Balance	162
Assets Write-off [Member]
Restructuring and Related Cost, Expected Cost [Abstract]
Restructuring and Related Cost, Cost Incurred to Date	222
Restructuring and Related Cost, Expected Cost Remaining	0
Restructuring and Related Cost, Expected Cost, Total	$ 222