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Accounts Receivable, Net
6 Months Ended
Jun. 30, 2013
Receivables [Abstract]  
Accounts Receivable, Net
2. Accounts Receivable, Net

Accounts receivable balances at June 30, 2013 and December 31, 2012 were as follows (in thousands):

 

     June 30,     December 31,  
     2013     2012  

Trade accounts receivable

   $ 120,276      $ 107,802   

Unbilled revenue

     52,949        41,005   
  

 

 

   

 

 

 

Total accounts receivable

     173,225        148,807   

Allowance for doubtful accounts

     (11,823     (11,749
  

 

 

   

 

 

 

Accounts receivable, net

   $ 161,402      $ 137,058