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GOODWILL (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]    
Goodwill, beginning of the year $ 38,107 $ 31,388
Additions in respect of acquisitions 0 6,070
Foreign currency translation adjustments 2,903 649
Goodwill, end of year $ 41,010 $ 38,107