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INCOME TAXES (Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Differences between total income tax expense and the amount computed by applying the statutory federal income tax rate to income before income taxes |  |  |
Statutory rate applied to pre-tax income | $ 55,448 | $ 77,384 | $ 77,419
State and local income taxes, net of federal tax benefit | 6,149 | 8,830 | 8,844
Net impact of the U.S. Tax Act | 0 | 0 | 4,823
Foreign withholding taxes | 0 | 0 | (4,424)
Resolution and settlements to uncertain tax positions | (4,146) | (9,432) | (457)
Foreign Derived Intangible Income Deduction | (1,267) | (4,315) | (2,647)
Foreign rate variance | 85 | 7,023 | (4,560)
Valuation allowances | 4,753 | 3,198 | 5,596
Research and development credit | (4,400) | (4,786) | (3,859)
Other | 1,274 | (2,492) | 932
Total | $ 57,896 | $ 75,410 | $ 81,667
Effective tax rate | 21.90% | 20.50% | 22.20%
Total income tax payments, net of refunds | $ 59,360 | $ 42,880 | $ 85,805

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