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GOODWILL AND OTHER INTANGIBLE ASSETS, Changes (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Goodwill [Abstract]    
Balance at beginning of period $ 187,591  
Acquired during the period 6,442  
Translation adjustment 0  
Balance at end of period 194,033  
Other Intangibles Assets [Roll Forward]    
Balance at beginning of period 78,525  
Acquired during the period 6,185  
Translation adjustment (551)  
Amortization (8,477) $ (8,607)
Balance at end of period 75,682  
Total Goodwill and Intangible Assets [Roll Forward]    
Balance at beginning of period 266,116  
Acquired during the period 12,627  
Translation adjustment (551)  
Amortization (8,477) $ (8,607)
Balance at end of period $ 269,715