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Acquisitions - Acquisitions (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Nov. 14, 2018
Oct. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]          
Net cash consideration     $ 107,462 $ 0 $ 0
Department Of Justice Lawsuit          
Business Acquisition [Line Items]          
Payments for legal settlements     20,000    
Farelogix          
Business Acquisition [Line Items]          
Consideration transferred $ 360,000        
Farelogix | Department Of Justice Lawsuit          
Business Acquisition [Line Items]          
Payments for legal settlements     $ 20,000    
Radixx Solutions International, Inc.          
Business Acquisition [Line Items]          
Net cash consideration   $ 107,000