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Business Combinations VCT Vogel GmbH (Details) $ in Thousands, € in Millions | Sep. 20, 2017 USD ($) | Aug. 31, 2017 USD ($) | Aug. 31, 2017 EUR (€)
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Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 419,394 |  |
VCT Vogel GmbH [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00% | 100.00%
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  | $ 4,139 | € 3.5

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