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Goodwill and Other Intangible Assets (Schedule of Changes in Intangible Assets and Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Amortized intangible assets: |  |
Beginning balance | $ 66,454 | $ 154
Acquisition |  | 71,630
Amortization | (6,864) | (5,330)
Other Changes | (4,149) |
Currency Translation |  |
Ending balance | 55,441 | 66,454
Beginning balance | 160,375 | 66,373
Acquisition |  | 95,730
Amortization |  |
Currency Translation | 6,421 | (1,728)
Ending balance | $ 166,796 | 160,375
AEC Trade Names [Member] |  |
Amortized intangible assets: |  |
Amortization life in year | 15 years |
Beginning balance | $ 20 | 25
Acquisition |  |
Amortization | (5) | (5)
Other Changes |  |
Currency Translation |  |
Ending balance | $ 15 | 20
AEC Technology [Member] |  |
Amortized intangible assets: |  |
Amortization life in year | 15 years |
Beginning balance | $ 104 | 129
Acquisition |  |
Amortization | (24) | (25)
Other Changes |  |
Currency Translation |  |
Ending balance | $ 80 | 104
Customer Contracts [Member] |  |
Amortized intangible assets: |  |
Amortization life in year | 6 years |
Beginning balance | $ 17,859 |
Acquisition |  | 20,420
Amortization | (3,280) | (2,561)
Other Changes | (961) |
Currency Translation |  |
Ending balance | $ 13,618 | 17,859
Customer Relationships [Member] |  |
Amortized intangible assets: |  |
Amortization life in year | 15 years |
Beginning balance | $ 47,009 |
Acquisition |  | 49,490
Amortization | (3,280) | (2,481)
Other Changes | (2,211) |
Currency Translation |  |
Ending balance | $ 41,518 | 47,009
Other Intangible Assets [Member] |  |
Amortized intangible assets: |  |
Amortization life in year | 5 years |
Beginning balance | $ 1,462 |
Acquisition |  | 1,720
Amortization | (275) | (258)
Other Changes | (977) |
Currency Translation |  |
Ending balance | 210 | 1,462
MC Goodwill [Member] |  |
Amortized intangible assets: |  |
Beginning balance | 64,645 | 66,373
Acquisition |  |
Amortization |  |
Currency Translation | 6,421 | (1,728)
Ending balance | 71,066 | 64,645
AEC Goodwill [Member] |  |
Amortized intangible assets: |  |
Beginning balance | 95,730 |
Acquisition |  | 95,730
Amortization |  |
Currency Translation |  |
Ending balance | $ 95,730 | $ 95,730

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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