Goodwill and Other Intangible Assets (Schedule of changes in intangible assets and goodwill) (Details) $ in Thousands	6 Months Ended
Jun. 30, 2018 USD ($)
Amortized intangible assets:
Beginning Balance	$ 55,441
Amortization	(3,119)
Currency Translation
Ending Balance	52,322
Goodwill
Beginning Balance	166,796
Amortization
Currency Translation	(1,322)
Ending Balance	165,474
AEC Trade Names [Member]
Amortized intangible assets:
Beginning Balance	15
Amortization	(2)
Currency Translation
Ending Balance	13
AEC Technology [Member]
Amortized intangible assets:
Beginning Balance	80
Amortization	(12)
Currency Translation
Ending Balance	68
Customer Relationships [Member]
Amortized intangible assets:
Beginning Balance	42,767
Amortization	(1,615)
Currency Translation
Ending Balance	41,152
Customer Contracts [Member]
Amortized intangible assets:
Beginning Balance	12,369
Amortization	(1,457)
Currency Translation
Ending Balance	10,912
Other Intangible [Member]
Amortized intangible assets:
Beginning Balance	210
Amortization	(33)
Currency Translation
Ending Balance	177
MC Goodwill [Member]
Goodwill
Beginning Balance	71,066
Amortization
Currency Translation	(1,322)
Ending Balance	69,744
AEC Goodwill [Member]
Goodwill
Beginning Balance	95,730
Amortization
Currency Translation
Ending Balance	$ 95,730

Goodwill [Abstract].

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- Definition

Goodwill amortization.

+ References

No definition available.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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-Name Accounting Standards Codification
-Topic 350
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-Section 50
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-Topic 350
-SubTopic 30
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-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

No definition available.

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Publisher FASB
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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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