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GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Goodwill    
Balance at beginning of period $ 187,591  
Acquired during the period 6,461  
Translation adjustment 0  
Balance at end of period 194,052  
Other Intangible Assets    
Balance at beginning of period 78,525  
Acquired during the period 6,185  
Translation adjustment (352)  
Amortization (12,575) $ (12,943)
Balance at end of period 71,783  
Total    
Balance at beginning of period 266,116  
Acquired during the period 12,646  
Translation adjustment (352)  
Amortization (12,575) $ (12,943)
Balance at end of period $ 265,835