SEGMENT INFORMATION (Reconciliation of Segment Operating Profit to Consolidated Income Before Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment operating profit	$ 542,316	$ 379,324	$ 302,850
Stock-based compensation expense	(111,655)	(75,238)	(72,036)
Amortization of purchased intangibles	(17,646)	(12,340)	(9,914)
Interest and other (loss)/income, net	(1,727)	3,822	8,725
Foreign exchange loss	(7,197)	(4,667)	(12,049)
Income before provision for income taxes	533,392	378,479	299,526
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment operating profit	729,072	503,909	425,967
Unallocated Amounts
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Stock-based compensation expense	(111,655)	(75,238)	(72,036)
Amortization of purchased intangibles	(17,646)	(12,340)	(9,914)
Other acquisition-related expenses	(6,397)	(1,868)	(3,774)
Other unallocated costs	$ (51,058)	$ (35,139)	$ (37,393)