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Accounts receivable (Tables)
12 Months Ended
Dec. 31, 2012
Accounts receivable [Abstract]  
Accounts receivable
Accounts receivable consist of the following:

 
 
December 31,
 
(in thousands)
 
2012
 
 
2011
 
Billed
 
$
76,155
 
 
$
55,188
 
Unbilled
 
 
19,888
 
 
 
18,965
 
Total
 
$
96,043
 
 
$
74,153