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Property and Equipment (Tables)
6 Months Ended
Jun. 30, 2012
Property and Equipment [Abstract]  
Schedule of Property and Equipment
                 
    December 31, 2011     June 30, 2012  
     

Computers and equipment

  $ 8,799     $ 9,871  

Software and development costs

    43,922       49,691  

Furniture and fixtures

    3,046       3,265  

Leasehold improvements

    6,752       6,964  
   

 

 

   

 

 

 
    $ 62,519     $ 69,791  
     

Less accumulated depreciation and amortization

    (43,505     (46,634
   

 

 

   

 

 

 

Property and equipment, net

  $ 19,014     $ 23,157