OTHER NON-CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities, Noncurrent [Abstract]
Income tax liabilities	$ 5,955	$ 0
Deferred revenue	2,101	5,680
Other non-current liabilities	4,226	4,800
Total	$ 12,282	$ 10,480