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Goodwill and Other Intangible Assets (Schedule of intangible assets and goodwill) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Amortized intangible assets: |  |
Gross carrying value | $ 66,724 | $ 66,724
Accumulated amortization | (15,959) | (11,283)
Net carrying amount | 50,765 | 55,441
Goodwill |  |
Gross carrying value | 165,103 | 166,796
Accumulated amortization |  |
Net carrying amount | 165,103 | 166,796
AEC Trade Names [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | 140 | 140
Accumulated amortization | (128) | (125)
Net carrying amount | $ 12 | $ 15
Goodwill |  |
Amortization life in years | 15 years | 15 years
AEC Technology [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | $ 370 | $ 370
Accumulated amortization | (308) | (290)
Net carrying amount | $ 62 | $ 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 | (8,076) | (5,654)
Net carrying amount | $ 40,345 | $ 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 | (7,287) | (5,102)
Net carrying amount | $ 10,184 | $ 12,369
Goodwill |  |
Amortization life in years | 6 years | 6 years
Other Intangible [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | $ 322 | $ 322
Accumulated amortization | (160) | (112)
Net carrying amount | $ 162 | $ 210
Goodwill |  |
Amortization life in years | 5 years | 5 years
MC Goodwill [Member] |  |
Goodwill |  |
Gross carrying value | $ 69,373 | $ 71,066
Accumulated amortization |  |
Net carrying amount | 69,373 | 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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