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
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross $ 307,296 $ 296,683
Less: Accumulated depreciation and amortization (153,340) (143,155)
Property, equipment, and software, net 153,956 153,528
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross 64,135 63,391
Data processing and communications equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross 71,197 68,015
Furniture, fixtures, and other equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross 34,057 33,840
Software    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross $ 137,907 $ 131,437