DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Schedule of Reclassifications of Other Comprehensive Income Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Research and development	$ 38,098	$ 29,505	$ 74,793	$ 55,704
Sales and marketing	20,936	22,127	45,189	42,299
General and administrative	13,964	13,685	30,149	25,376
Total, before income taxes	72,998	65,317	145,231	123,379
Income tax expense	4,862	13,213	13,784	17,135
Total, net of income taxes	$ 36,668	$ 32,913	78,916	50,888
Unrealized gains on cash flow hedges, net [Member] | Amount Reclassified from Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of Revenues			99
Research and development			270
Sales and marketing			61
General and administrative			66
Total, before income taxes			496
Income tax expense			(61)
Total, net of income taxes			$ 435