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Accounts receivable (Tables)
12 Months Ended
Dec. 31, 2016
Accounts receivable [Abstract]  
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