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INCOME TAXES (Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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 | $ 144,242 | $ 124,492 | $ 68,250
State and local income taxes, net of federal tax benefit | 17,979 | 12,904 | 4,005
Excess tax benefits resulting from exercises of stock-based compensation | (10,742) | (2,500) | (4,681)
Foreign Derived Intangible Income Deduction | (10,411) | (13,356) | (2,197)
Foreign rate variance | 6,854 | 5,020 | 2,131
Valuation allowances | (4,135) | (4,547) | (4,209)
Research and development credit | (9,600) | (6,800) | (5,300)
Pension plan termination adjustment | 0 | 0 | (14,711)
U.S. tax cost of foreign source income | 1,013 | 783 | 3,488
Other | 6,418 | 4,607 | 1,642
Total | $ 141,618 | $ 120,603 | $ 48,418
Effective tax rate | 20.60% | 20.30% | 14.90%
Total income tax payments, net of refunds | $ 180,512 | $ 151,818 | $ 87,288

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