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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, 2017 | Dec. 31, 2016
Amortized intangible assets: |  |
Gross carrying value | $ 67,752 | $ 71,901
Accumulated amortization | 10,755 | 5,447
Net carrying amount | 56,997 | 66,454
Goodwill |  |
Gross carrying value | 166,010 | 160,375
Accumulated amortization |  |
Net carrying amount | 166,010 | 160,375
AEC Trade Names [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | 43 | 43
Accumulated amortization | 27 | 23
Net carrying amount | $ 16 | $ 20
Goodwill |  |
Amortization life in years | 15 years | 15 years
AEC Technology [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | $ 228 | $ 228
Accumulated amortization | 142 | 124
Net carrying amount | $ 86 | $ 104
Goodwill |  |
Amortization life in years | 15 years | 15 years
Customer Relationships [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | $ 48,528 | $ 49,490
Accumulated amortization | 4,956 | 2,481
Net carrying amount | $ 43,572 | $ 47,009
Goodwill |  |
Amortization life in years | 15 years | 15 years
Customer Contracts [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | $ 18,211 | $ 20,420
Accumulated amortization | 5,114 | 2,561
Net carrying amount | $ 13,097 | $ 17,859
Goodwill |  |
Amortization life in years | 6 years | 6 years
Other Intangible [Member] |  |
Amortized intangible assets: |  |
Gross carrying value | $ 742 | $ 1,720
Accumulated amortization | 516 | 258
Net carrying amount | $ 226 | $ 1,462
Goodwill |  |
Amortization life in years | 5 years | 5 years
MC Goodwill [Member] |  |
Goodwill |  |
Gross carrying value | $ 70,280 | $ 64,645
Accumulated amortization |  |
Net carrying amount | 70,280 | 64,645
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://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 Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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