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GOODWILL (Tables)
12 Months Ended
Dec. 31, 2014
Goodwill, Carrying Amount in Foreign Countries  
Schedule of changes in the carrying amount of goodwill
(in thousands)    
Goodwill at December 31, 2012   $ 212,477  
Goodwill acquired     40  
Goodwill adjustments due to currency translation     (670 )
Goodwill at December 31, 2013   $ 211,847  
Goodwill acquired and finalization of allocation of purchase price on previous acquisitions     48,477  
Goodwill adjustments due to currency translation     (4,761 )
Goodwill at December 31, 2014   $ 255,563