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Goodwill and Other Intangible Assets (Schedule of intangible assets and goodwill) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Amortized intangible assets: |  |
Gross carrying value | $ 66,724 | $ 66,724
Accumulated amortization | (14,402) | (11,283)
Net carrying amount | 52,322 | 55,441
Goodwill |  |
Gross carrying value | 165,474 | 166,796
Accumulated amortization |  |
Net carrying amount | 165,474 | 166,796
AEC Trade Names [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | 140 | 140
Accumulated amortization | (127) | (125)
Net carrying amount | $ 13 | $ 15
Goodwill |  |
Amortization life in years | 15 years | 15 years
AEC Technology [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | $ 370 | $ 370
Accumulated amortization | (302) | (290)
Net carrying amount | $ 68 | $ 80
Goodwill |  |
Amortization life in years | 15 years | 15 years
Customer Relationships [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | $ 48,421 | $ 48,421
Accumulated amortization | (7,269) | (5,654)
Net carrying amount | $ 41,152 | $ 42,767
Goodwill |  |
Amortization life in years | 15 years | 15 years
Customer Contracts [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | $ 17,471 | $ 17,471
Accumulated amortization | (6,559) | (5,102)
Net carrying amount | $ 10,912 | $ 12,369
Goodwill |  |
Amortization life in years | 6 years | 6 years
Other Intangible [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | $ 322 | $ 322
Accumulated amortization | (145) | (112)
Net carrying amount | $ 177 | $ 210
Goodwill |  |
Amortization life in years | 5 years | 5 years
MC Goodwill [Member] |  |
Goodwill |  |
Gross carrying value | $ 69,744 | $ 71,066
Accumulated amortization |  |
Net carrying amount | 69,744 | 71,066
AEC Goodwill [Member] |  |
Goodwill |  |
Gross carrying value | 95,730 | 95,730
Accumulated amortization |  |
Net carrying amount | $ 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://fasb.org/us-gaap/role/ref/legacyRef -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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