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INCOME TAXES - THE RECONCILIATION OF THE U.S. FEDERAL STATUTORY TAX RATE TO THE EFFECTIVE RATE (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Statutory U.S. federal income tax rate | 21.00% | 21.00% | 21.00%
State income taxes, net of federal benefit | 2.30% | 0.70% | (0.10%)
Federal benefit of R&D and foreign tax credits | 15.80% | (2.00%) | 1.00%
US other permanent differences | (0.056) | 0.008 | (0.001)
Tax effect of international operations | 4.70% | 0.40% | 1.40%
Global Intangible Low Taxed Income (GILTI) | (10.90%) | 3.70% | (1.10%)
Foreign Derived Intangible Income (FDII) | 9.90% | (0.10%) | 0.00%
Net effect of tax audit activity | (6.90%) | 0.40% | (1.00%)
Tax effect of enacted statutory rate changes on Non-U.S. jurisdictions | (0.20%) | 0.10% | 0.30%
Federal tax on unremitted earnings of certain foreign subsidiaries | (4.60%) | 0.10% | (0.10%)
Valuation allowance adjustments | (12.90%) | (1.30%) | (5.70%)
U.S. tax reform - net impacts | 0 | 0 | 0.004
Tax effect of impairment of goodwill and intangibles | (51.00%) | (0.20%) | (22.20%)
Other | 0.10% | 0.20% | 0.70%
Effective income tax rate on operations | (38.30%) | 23.80% | (5.50%)

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