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Goodwill and Other Intangible Assets (Schedule of intangible assets and goodwill) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Amortized intangible assets: |  |
Gross carrying value | $ 66,724 | $ 66,724
Accumulated amortization | (19,078) | (17,518)
Net carrying amount | 47,646 | 49,206
Goodwill |  |
Gross carrying value | 163,438 | 164,382
Accumulated amortization |  |
Net carrying amount | 163,438 | 164,382
AEC Trade Names [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | 140 | 140
Accumulated amortization | (131) | (129)
Net carrying amount | $ 9 | $ 11
Goodwill |  |
Amortization life in years | 15 years | 15 years
AEC Technology [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | $ 370 | $ 370
Accumulated amortization | (321) | (314)
Net carrying amount | $ 49 | $ 56
Goodwill |  |
Amortization life in years | 15 years | 15 years
Customer Relationships [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | $ 48,421 | $ 48,421
Accumulated amortization | (9,690) | (8,883)
Net carrying amount | $ 38,731 | $ 39,538
Goodwill |  |
Amortization life in years | 15 years | 15 years
Customer Contracts [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | $ 17,471 | $ 17,471
Accumulated amortization | (8,743) | (8,015)
Net carrying amount | $ 8,728 | $ 9,456
Goodwill |  |
Amortization life in years | 6 years | 6 years
Other Intangible [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | $ 322 | $ 322
Accumulated amortization | (193) | (177)
Net carrying amount | $ 129 | $ 145
Goodwill |  |
Amortization life in years | 5 years | 5 years
MC Goodwill [Member] |  |
Goodwill |  |
Gross carrying value | $ 67,708 | $ 68,652
Accumulated amortization |  |
Net carrying amount | 67,708 | 68,652
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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