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Accounts Receivable And Unbilled Services (Tables)
9 Months Ended
Sep. 30, 2011
Accounts Receivable And Unbilled Services 
Accounts Receivable And Unbilled Services, Net
     December 31,
2010
    September 30,
2011
 

Billed

   $ 276,240      $ 320,167   

Unbilled

     168,037        190,081   

Allowance for doubtful accounts

     (8,401     (5,241
  

 

 

   

 

 

 

Total accounts receivable and unbilled services, net

   $ 435,876      $ 505,007