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Property and Equipment, Net (Tables)
6 Months Ended
Jun. 30, 2011
Property and Equipment, Net  
Components of Property and Equipment
     June 30,
2011
    December 31,
2010
 

Computer hardware

   $ 119,800      $ 115,518   

Computer software

     245,527        232,657   

Furniture and equipment

     115,595        115,730   

Leasehold improvements

     117,889        116,241   

Other

     15,142        14,716   
                

Property and equipment, cost

     613,953        594,862   

Accumulated depreciation

     (506,653     (491,211
                

Property and equipment, net

   $ 107,300      $ 103,651