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INCOME TAXES - Income Tax Rate Reconciliation (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of federal statutory tax rate with effective tax rate |  |  |
Federal statutory tax rate | 21.00% | 21.00% | 21.00%
Impact of one-time deemed repatriation | 0.00% | 0.00% | 6.20%
Impact on deferred taxes for changes in tax rates | 0.90% | 20.50% | (3.30%)
Additional deferred tax adjustments | 0.80% | 0.00% | (1.50%)
State income taxes, net of federal income tax benefit | (3.40%) | (19.20%) | 3.70%
Foreign rates varying from federal statutory tax rate | 1.30% | 3.10% | 0.10%
Tax contingencies | 5.50% | 15.70% | (0.90%)
Tax credits | 1.70% | 11.30% | 0.20%
Other permanent book-tax differences | (3.30%) | (8.60%) | 0.80%
Change in foreign valuation allowance | (11.90%) | 0.00% | 0.00%
Other | 1.50% | 1.10% | 0.00%
Effective tax rate | 14.10% | 44.90% | 26.30%

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