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INCOME TAXES - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax provision at the federal statutory rate of 21%	$ 123,225	$ 105,600	$ 97,106
State income taxes, net of effect of federal tax benefit	7,679	9,627	7,246
Stock-based compensation	(112,203)	(90,374)	(92,140)
Research credits	(21,306)	(27,248)	(6,701)
Change in valuation allowance for foreign tax credits	29,787	0	0
Foreign income taxed at a different statutory rate	4,884	3,526	13,129
Withholding taxes	2,933	5,023	3,566
Change in uncertain tax positions	(5,770)	(637)	(1,780)
Non-taxable foreign currency exchange gains and losses	688	(557)	(2,086)
Transition tax	0	0	(3,178)
Other, net	2,957	3,265	(3,855)
Income tax (benefit) provision	$ 32,874	$ 8,225	$ 11,307

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