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Accounts Receivable (Tables)
6 Months Ended
Jun. 30, 2012
Accounts Receivable [Abstract]  
Schedule of Accounts receivable
                 
    December 31, 2011     June 30, 2012  
     

Trade receivables

  $ 11,128     $ 12,534  

Unpaid amounts for benefit services

    4,588       5,689  
   

 

 

   

 

 

 
      15,716       18,223  

Less allowance for doubtful accounts

    (69     (197
   

 

 

   

 

 

 

Accounts receivable, net

  $ 15,647     $ 18,026