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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 (€)
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