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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill by Reportable Segment (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Goodwill [Line Items]  
Balance $ 584,150
Foreign currency translation adjustment (2,535)
Balance 581,615
Commercial Services  
Goodwill [Line Items]  
Balance 424,404
Foreign currency translation adjustment (2,535)
Balance 421,869
Government Solutions  
Goodwill [Line Items]  
Balance 159,746
Balance $ 159,746