GOODWILL (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in goodwill
Beginning balance	$ 17,757	$ 18,303	$ 20,233
Goodwill acquired	10,248
Acquisition adjustments			(1,223)
Effect of foreign currency translation	(483)	(546)	(707)
Ending balance	$ 27,522	$ 17,757	$ 18,303