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, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross $ 159,295 $ 150,502
Less: Accumulated depreciation and amortization (88,464) (77,886)
Property, equipment and software, net 70,831 72,616
Leasehold Improvements    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 21,371 22,943
Data Processing and Communications Equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 63,600 59,390
Furniture, Fixtures, and Other Equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 17,611 16,254
Software    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross $ 56,713 $ 51,915