Goodwill and Other Intangible Assets (Schedule of Changes in Intangible Assets and Goodwill) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 52,892
Other Changes	329
Amortization	(5,412)
Currency Translation	472
Ending balance	48,281
Goodwill [Roll Forward]
Beginning balance	180,934
Other Changes	335
Amortization	0
Currency Translation	3,018
Ending balance	184,287
AEC Trademarks and trade names [Member]
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	73
Other Changes	0
Amortization	(13)
Currency Translation	0
Ending balance	60
Goodwill [Roll Forward]
Beginning balance	73
Ending balance	60
AEC Technology [Member]
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	5,804
Other Changes	0
Amortization	(480)
Currency Translation	327
Ending balance	5,651
Goodwill [Roll Forward]
Beginning balance	5,804
Ending balance	5,651
AEC Intellectual property [Member]
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	1,243
Other Changes	0
Amortization	(61)
Currency Translation	0
Ending balance	1,182
Goodwill [Roll Forward]
Beginning balance	1,243
Ending balance	1,182
AEC Customer contracts [Member]
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	6,544
Other Changes	0
Amortization	(2,183)
Currency Translation	0
Ending balance	4,361
Goodwill [Roll Forward]
Beginning balance	6,544
Ending balance	4,361
AEC Customer relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	39,147
Other Changes	329
Amortization	(2,626)
Currency Translation	145
Ending balance	36,995
Goodwill [Roll Forward]
Beginning balance	39,147
Ending balance	36,995
AEC Other intangibles [Member]
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	81
Other Changes	0
Amortization	(49)
Currency Translation	0
Ending balance	32
Goodwill [Roll Forward]
Beginning balance	81
Ending balance	32
MC Goodwill [Member]
Goodwill [Roll Forward]
Beginning balance	67,672
Other Changes	0
Amortization	0
Currency Translation	2,212
Ending balance	69,884
AEC Goodwill [Member]
Goodwill [Roll Forward]
Beginning balance	113,262
Other Changes	335
Amortization	0
Currency Translation	806
Ending balance	$ 114,403