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, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross $ 199,691 $ 181,234
Less: Accumulated depreciation and amortization (105,503) (99,036)
Property, equipment and software, net 94,188 82,198
Leasehold Improvements    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 29,701 26,138
Data Processing and Communications Equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 70,630 67,871
Furniture, Fixtures, and Other Equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 25,627 18,253
Software    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross $ 73,733 $ 68,972