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Goodwill (Tables)
6 Months Ended
Jun. 30, 2013
Goodwill
   
June 30,
   
December 31,
 
   
2013
   
2012
 
   
(in thousands)
 
             
Opening balance
  $ 315,441     $ 253,393  
Current period acquisitions
    43,877       55,759  
Prior period acquisitions
    -       1,382  
Foreign exchange movement
    (4,739 )     4,907  
 
Closing balance
  $ 354,579     $ 315,441