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Differences between the United States federal statutory income tax rate and the effective income tax rate were as follows: (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Statutory rates | 21.00% | 21.00% | 21.00%
State and local taxes, net of Federal benefit | 0.30% | 0.20% | 0.60%
Windfall benefit from exercise of stock options | (0.90%) | (0.60%) | (0.70%)
Benefit of Foreign Derived Intangible Income | (0.60%) | (0.40%) | (0.90%)
U.S. statutory rates | 7.40% | 7.50% | 7.50%
Other | (0.10%) | 0.20% | 0.10%
Effective rates | 27.10% | 27.90% | 27.60%

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