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Accounts Receivable (Tables)
6 Months Ended
Jun. 30, 2016
Schedule of Accounts Receivable

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

 

     June 30,      December 31,  
     2016      2015  

Billed and billable

   $ 132,820       $ 175,382   

Less: unpaid deferred revenue

     (73,890      (103,403
  

 

 

    

 

 

 

Accounts receivable, gross

     58,930         71,979   

Less: allowance for doubtful accounts

     (4,043      (3,825
  

 

 

    

 

 

 

Accounts receivable, net

   $ 54,887       $ 68,154