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Goodwill
 9 Months Ended
Sep. 30, 2016
Goodwill
2. Goodwill

   
Nine months ended
    
Year ended
  
   
September 30,
    
December 31,
  
   
2016
    
2015
  
   
(in thousands)
  
             
Opening balance
  
$
588,434
    
$
463,324
  
Current period acquisitions (Note 3)
    
39,376
      
133,123
  
Prior period acquisitions (Note 3) 
    
5,403
      
4,418
  
Foreign exchange movement
    
(6,556
)
    
(12,431
)
                 
Closing balance
  
$
626,657
    
$
588,434