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Business Acquisitions (Details textual) - USD ($)
$ in Thousands
Oct. 16, 2018
Sep. 10, 2018
Jun. 30, 2019
Dec. 31, 2018
Feb. 06, 2018
Business Acquisition [Line Items]          
Goodwill     $ 1,352,198 $ 904,571  
Acyclica [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 3,900      
Goodwill   6,000      
Business Combination, Consideration Transferred   $ 9,700      
SeaPilot [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 2,400        
Goodwill 2,300        
Business Combination, Consideration Transferred $ 4,600        
Consumer and Small and Medium-Sized Security Business [Member] | Held-for-sale [Member]          
Business Acquisition [Line Items]          
Carrying amount of disposal group         $ 28,800