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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
Statutory rates 21.00% 21.00% 21.00%
State and local taxes, net of Federal benefit 0.70% 0.80% 1.10%
Windfall benefit from exercise of stock options (0.30%) (0.40%) (0.40%)
Benefit of Foreign Derived Intangible Income (0.90%) (0.90%) (0.80%)
Effect of foreign taxes greater than U.S. statutory rates 3.50% 4.10% 1.50%
Other 0.20% 0.20% (0.20%)
Effective rates 24.20% 24.80% 22.20%