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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
Statutory rates 21.00% 21.00% 21.00%
State and local taxes, net of Federal benefit 0.20% 0.20% 0.30%
Windfall benefit from exercise of stock options (0.40%) (0.40%) (0.90%)
Benefit of Foreign Derived Intangible Income (0.90%) (0.80%) (0.60%)
Effect of foreign taxes greater than U.S. statutory rates 4.30% 3.10% 7.40%
Other 0.60% (0.90%) (0.10%)
Effective rates 24.80% 22.20% 27.10%