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Business Combinations Hudson Intangible Assets Acquired (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 20, 2017
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 14 years |
Identifiable intangible assets |  | $ 202,000
Customer relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 12 years |
Unpatented technology [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 12 years |
Hudson [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  | 129,600
Identifiable intangible assets |  | 202,000
Hudson [Member] | Customer relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 109,200
Hudson [Member] | Unpatented technology [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 12 years |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 19,200
Hudson [Member] | Customer backlog [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 2 years |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 1,200
Hudson [Member] | Trademarks and trade names [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  | $ 72,400
Minimum [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 1 year |
Minimum [Member] | Hudson [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 2 years |
Maximum [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 50 years |
Maximum [Member] | Hudson [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 12 years |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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 Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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