DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Nonhedging Designation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Not designated as hedging instruments | Foreign currency exchange contracts | Interest and other income (expense), net
Net (losses) gains on derivative instruments
Amount of (loss) gain recognized in income on derivatives	$ 10,393	$ (4,439)	$ 5,734	$ (9,467)