Goodwill and Other Intangible Assets (Schedule of changes in intangible assets and goodwill) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Amortized intangible assets:
Beginning Balance	$ 55,441
Amortization	(4,676)
Currency Translation
Ending Balance	50,765
Goodwill
Beginning Balance	166,796
Amortization
Currency Translation	(1,693)
Ending Balance	165,103
AEC Trade Names [Member]
Amortized intangible assets:
Beginning Balance	15
Amortization	(3)
Currency Translation
Ending Balance	12
AEC Technology [Member]
Amortized intangible assets:
Beginning Balance	80
Amortization	(18)
Currency Translation
Ending Balance	62
Customer Relationships [Member]
Amortized intangible assets:
Beginning Balance	42,767
Amortization	(2,422)
Currency Translation
Ending Balance	40,345
Customer Contracts [Member]
Amortized intangible assets:
Beginning Balance	12,369
Amortization	(2,185)
Currency Translation
Ending Balance	10,184
Other Intangible [Member]
Amortized intangible assets:
Beginning Balance	210
Amortization	(48)
Currency Translation
Ending Balance	162
MC Goodwill [Member]
Goodwill
Beginning Balance	71,066
Amortization
Currency Translation	(1,693)
Ending Balance	69,373
AEC Goodwill [Member]
Goodwill
Beginning Balance	95,730
Amortization
Currency Translation
Ending Balance	$ 95,730