INCOME TAXES - Reconciliation of the Statutory U.S. Federal Tax Rate to the Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]
Statutory U.S. federal income tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal benefit	0.20%	0.10%	(0.20%)
Effect of foreign operations	(5.20%)	(5.40%)	(4.70%)
Accruals and reserves	(1.00%)	(1.10%)
Nondeductible employee compensation	2.60%	2.50%	1.70%
Research tax credits	(1.80%)	(1.40%)	(2.70%)
Stock based compensation	(0.90%)	(1.70%)	(2.70%)
U.S. Tax Cuts and Jobs Act			(3.50%)
U.S. International Tax (Sub F, GILTI, FDII)	3.50%	3.80%	(1.20%)
Other		0.80%	0.80%
Effective tax rate	18.40%	18.60%	8.50%