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, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross $ 227,402 $ 181,234
Less: Accumulated depreciation and amortization (112,645) (99,036)
Property, equipment, and software, net 114,757 82,198
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 54,235 26,138
Data processing and communications equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 72,905 67,871
Furniture, fixtures, and other equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 22,927 18,253
Software    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross $ 77,335 $ 68,972