Goodwill and Other Intangible Assets (Schedule of Changes in Intangible Assets and Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Amortized intangible assets:
Beginning balance	$ 52,892
Other Changes	329
Amortization	(1,790)
Currency Translation	(108)
Ending balance	51,323
Beginning balance	180,934
Other Changes	(227)
Amortization
Currency Translation	(1,341)
Ending balance	179,366
AEC Trademarks and Trade Names [Member]
Amortized intangible assets:
Beginning balance	73
Other Changes
Amortization	(4)
Currency Translation
Ending balance	69
AEC Technology [Member]
Amortized intangible assets:
Beginning balance	5,804
Other Changes
Amortization	(150)
Currency Translation	(49)
Ending balance	5,605
AEC Intellectual Property [Member]
Amortized intangible assets:
Beginning balance	1,243
Other Changes
Amortization	(21)
Currency Translation
Ending balance	1,222
AEC Customer Contracts [Member]
Amortized intangible assets:
Beginning balance	6,544
Other Changes
Amortization	(728)
Currency Translation
Ending balance	5,816
AEC Customer Relationships [Member]
Amortized intangible assets:
Beginning balance	39,147
Other Changes	329
Amortization	(871)
Currency Translation	(59)
Ending balance	38,546
Other Intangible [Member]
Amortized intangible assets:
Beginning balance	81
Other Changes
Amortization	(16)
Currency Translation
Ending balance	65
MC Goodwill [Member]
Amortized intangible assets:
Beginning balance	67,672
Other Changes
Amortization
Currency Translation	(993)
Ending balance	66,679
AEC Goodwill [Member]
Amortized intangible assets:
Beginning balance	113,262
Other Changes	(227)
Amortization
Currency Translation	(348)
Ending balance	$ 112,687