OTHER INCOME, NET (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
Interest income, net	$ 13,804	$ 4,189	$ 1,724
Transaction gain (loss) on foreign exchange	(70)	258	(175)
Other non-operating income, net	375	417	145
Other income, net	$ 14,109	$ 4,864	$ 1,694