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Acquisition (Details) - USD ($)
$ in Thousands
6 Months Ended
Apr. 01, 2019
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Business Acquisition [Line Items]        
Payables recorded under contingent payment arrangements   $ 17,384   $ 0
Goodwill   $ 3,076,926 $ 3,066,700  
Autonomous        
Business Acquisition [Line Items]        
Percentage of interests acquired 100.00%      
Initial cash purchase price consideration $ 6,500      
Payables recorded under contingent payment arrangements $ 17,400      
Contingent consideration payable, term 5 years 5 years    
Excess of purchase price over the current fair value of identifiable net assets acquired $ 5,600      
Goodwill $ 10,200      
Compensation expense, additional cash payments, amortization term 2 years      
Compensation expense, contingent consideration payable, amortization term 5 years      
Customer relationships and trademarks | Autonomous        
Business Acquisition [Line Items]        
Intangible assets acquired $ 8,100