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Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2011
Accounts Receivable (Tables) [Abstract]  
Summary of accounts Receivable
                 
    2011     2010  

Billed receivables

  $ 148,055     $ 122,874  

Unbilled receivables

    9,442       7,718  
   

 

 

   

 

 

 

Total receivables

    157,497       130,592  

Less allowance for doubtful accounts

    (4,158     (4,028
   

 

 

   

 

 

 

Accounts receivable, net

  $ 153,339     $ 126,564