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INCOME TAXES - Reconciliation of the Statutory U.S. Federal Tax Rate to the Effective Tax Rate (Details) | 12 Months Ended
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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%

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