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INCOME TAXES (Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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 | $ 68,250 | $ 55,448 | $ 77,384
State and local income taxes, net of federal tax benefit | 4,005 | 6,148 | 8,831
Excess tax benefits resulting from exercises of stock-based compensation | (4,681) | (2,471) | (3,451)
Resolution and settlements to uncertain tax positions | 577 | (4,146) | (9,432)
Foreign Derived Intangible Income Deduction | (2,197) | (1,267) | (4,315)
Foreign rate variance | 2,131 | 85 | 7,023
Valuation allowances | (4,209) | 4,753 | 3,198
Research and development credit | (5,300) | (4,400) | (4,786)
Pension plan termination adjustment | (14,711) | 0 | 0
U.S. tax cost (benefit) of foreign source income | 3,488 | 269 | 1,783
Other | 1,065 | 3,477 | (825)
Total | $ 48,418 | $ 57,896 | $ 75,410
Effective tax rate | 14.90% | 21.90% | 20.50%
Total income tax payments, net of refunds | $ 87,288 | $ 59,360 | $ 42,880

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