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Goodwill
 3 Months Ended
Mar. 31, 2016
Goodwill
2. Goodwill

 
Three months ended
  
Year ended
  
 
March 31,
  
December 31,
  
 
2016
  
2015
  
 
(in thousands)
  
         
Opening balance
  
$
588,434
    
$
463,324
  
Current period acquisitions (Note 3)
    
-
      
133,123
  
Prior period acquisitions (Note 3)    
5,773
      
4,418
  
Foreign exchange movement
    
(322
)
    
(12,431
)
                 
Closing balance
  
$
593,885
    
$
588,434