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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