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INCOME TAXES (Provision (Benefit) for Income Taxes as a Percent) (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |
Statutory U.S. federal income tax rate | 21.00% | 21.00%
State income taxes, net of U.S. federal income tax benefit | 1.30% | 2.90%
U.S. tax impact of foreign operations | 6.70% | 12.30%
Valuation allowance change | (25.00%) | 10.30%
Unrecognized tax benefits | (6.10%) | (3.30%)
Permanent foreign items | 3.10% | 4.40%
Withholding tax on royalties | 2.80% | 4.20%
Stock compensation | (0.40%) | 7.10%
Tax return to provision differences | (3.30%) | (3.70%)
Elimination of provision on intercompany transactions | (2.00%) | (0.60%)
Other | 1.30% | 1.10%
Effective income tax rate | (0.60%) | 55.70%

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