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Accounts Receivable (Tables)
3 Months Ended
Mar. 31, 2016
Schedule of Accounts Receivable

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

 

     March 31,      December 31,  
     2016      2015  

Billed and billable

   $ 139,099       $ 175,382   

Less: unpaid deferred revenue

     (78,232      (103,403
  

 

 

    

 

 

 

Accounts receivable, gross

     60,867         71,979   

Less: allowance for doubtful accounts

     (4,309      (3,825
  

 

 

    

 

 

 

Accounts receivable, net

   $ 56,558       $ 68,154