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Accounts Receivable (Tables)
3 Months Ended
Mar. 31, 2015
Schedule of Accounts Receivable

Accounts receivable (in thousands) consisted of the following, as of:

 

     March 31,
2015
     December 31,
2014
 

Billed and billable

   $ 135,437       $ 187,470   

Less: unpaid deferred revenue

     (72,840      (104,425
  

 

 

    

 

 

 

Accounts receivable, gross

  62,597      83,045   

Less: allowance for doubtful accounts

  (4,161   (4,412
  

 

 

    

 

 

 

Accounts receivable, net

$ 58,436    $ 78,633