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
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross $ 288,084 $ 279,777
Less: Accumulated depreciation and amortization (142,744) (131,349)
Property, equipment, and software, net 145,340 148,428
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross 61,357 59,179
Data processing and communications equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross 76,357 83,922
Furniture, fixtures, and other equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross 31,635 28,752
Software    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross $ 118,735 $ 107,924