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, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross $ 260,311 $ 241,511
Less: Accumulated depreciation and amortization (122,070) (111,083)
Property, equipment, and software, net 138,241 130,428
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 54,107 51,242
Data processing and communications equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 81,916 76,773
Furniture, fixtures, and other equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 26,652 26,513
Software    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross $ 97,636 $ 86,983