OTHER INCOME, NET (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Income and Expenses [Abstract]
Interest income, net	$ 4,189	$ 1,724	$ 622
Transaction gain (loss) on foreign exchange	258	(175)	(687)
Other non-operating income, net	417	145	451
Other income, net	$ 4,864	$ 1,694	$ 386