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GOODWILL (Tables)
12 Months Ended
Dec. 31, 2015
Goodwill, Carrying Amount in Foreign Countries  
Schedule of changes in the carrying amount of goodwill
(in thousands)    
Goodwill at December 31, 2013   $ 211,847  
Goodwill acquired     48,477  
Goodwill adjustments due to currency translation     (4,761 )
Goodwill at December 31, 2014   $ 255,563  
Goodwill acquired and finalization of allocation of purchase price on previous acquisitions     196  
Goodwill adjustments due to currency translation     (5,820 )
Goodwill at December 31, 2015   $ 249,939