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GOODWILL (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Change in goodwill    
Beginning balance $ 17,757 $ 18,303
Goodwill acquired (Note 2) 10,025  
Effect of foreign currency translation 459 (546)
Ending balance $ 28,241 $ 17,757