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Accounts receivable
 12 Months Ended
Dec. 31, 2016
Accounts receivable [Abstract]  
Accounts receivable
5. Accounts receivable

Accounts receivable consist of the following:

 
December 31,
 
(in thousands)
2016
 
2015
 
Billed
 
$
90,439
  
$
95,735
 
Unbilled
  
48,039
   
18,171
 
Total
 
$
138,478
  
$
113,906
 

 Unbilled accounts receivable has increased by $29.9 million due to the timing of billings to under our contract with the U.S. government related to construction activities at our Bayview site and development work associated with Ebola.