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Accounts Receivable, Net (Tables)
9 Months Ended
Sep. 30, 2014
Receivables [Abstract]  
Accounts Receivable, Net

Accounts receivable balances at September 30, 2014 and December 31, 2013 were as follows (in thousands):

 

     September 30,     December 31,  
     2014     2013  

Trade accounts receivable

   $ 122,129      $ 109,739   

Unbilled revenue

     68,713        43,546   
  

 

 

   

 

 

 

Total accounts receivable

     190,842        153,285   

Allowance for doubtful accounts

     (11,052     (10,178
  

 

 

   

 

 

 

Accounts receivable, net

   $ 179,790      $ 143,107