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Accounts Receivable, Net
3 Months Ended
Mar. 31, 2015
Receivables [Abstract]  
Accounts Receivable, Net
2. Accounts Receivable, Net

Accounts receivable, net balances at March 31, 2015 and December 31, 2014 were as follows (in thousands):

 

     March 31,
2015
     December 31,
2014
 

Trade accounts receivable

   $ 117,672       $ 107,174   

Unbilled revenue

     82,364         47,789   
  

 

 

    

 

 

 

Total accounts receivable

  200,036      154,963   

Allowance for doubtful accounts

  (11,552   (11,915
  

 

 

    

 

 

 

Accounts receivable, net

$ 188,484    $ 143,048