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Business Acquisitions (Details 1) - USD ($)
$ in Thousands
Nov. 30, 2016
Nov. 04, 2016
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]            
Finite-lived intangible assets acquired   $ 200        
Goodwill     $ 904,571 $ 909,811 $ 909,811 $ 801,406
Point Grey Research, Inc. [Member]            
Business Acquisition [Line Items]            
Intangible assets acquired   39,800        
Goodwill   $ 183,678        
Prox Dynamics, AS [Member]            
Business Acquisition [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 123,100       31,400  
Indefinite-lived Intangible Assets Acquired 31400000          
Goodwill         $ 96,431  
Patents [Member] | Prox Dynamics, AS [Member]            
Business Acquisition [Line Items]            
Estimated Useful Life 8 years          
Indefinite-lived Intangible Assets Acquired 3100          
Developed technology | Point Grey Research, Inc. [Member]            
Business Acquisition [Line Items]            
Estimated Useful Life   10 years        
Developed technology | Prox Dynamics, AS [Member]            
Business Acquisition [Line Items]            
Estimated Useful Life 8 years          
Indefinite-lived Intangible Assets Acquired 23400          
Trade name | Point Grey Research, Inc. [Member]            
Business Acquisition [Line Items]            
Estimated Useful Life   7 years        
Finite-lived intangible assets acquired   $ 13,200        
Trade name | Prox Dynamics, AS [Member]            
Business Acquisition [Line Items]            
Estimated Useful Life 7 years          
Indefinite-lived Intangible Assets Acquired 3500          
Trade Names [Member] | Prox Dynamics, AS [Member]            
Business Acquisition [Line Items]            
Estimated Useful Life 8 years          
Indefinite-lived Intangible Assets Acquired 1400          
Backlog | Point Grey Research, Inc. [Member]            
Business Acquisition [Line Items]            
Estimated Useful Life   1 year        
Finite-lived intangible assets acquired   $ 2,300        
Non-Competition Agreements | Point Grey Research, Inc. [Member]            
Business Acquisition [Line Items]            
Estimated Useful Life   5 years        
Finite-lived intangible assets acquired   $ 1,000        
Developed technology | Point Grey Research, Inc. [Member]            
Business Acquisition [Line Items]            
Indefinite-lived intangible assets acquired   $ 23,100