Quarterly report pursuant to Section 13 or 15(d)

Property, Equipment and Software - Components of Property, Equipment and Software (Details)

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Property, Equipment and Software - Components of Property, Equipment and Software (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross $ 330,215 $ 296,683
Less: Accumulated depreciation and amortization (170,610) (143,155)
Property, equipment, and software, net 159,605 153,528
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross 66,697 63,391
Data processing and communications equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross 78,549 68,015
Furniture, fixtures, and other equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross 35,057 33,840
Software    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross $ 149,912 $ 131,437