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Income Tax Provision
 3 Months Ended
Mar. 31, 2025
Income Tax Disclosure [Abstract]  
Income Tax Provision Income Tax Provision
We had an effective income tax rate of 14.9% for the three months ended March 31, 2025, compared to 18.7% for the three months ended March 31, 2024. The decrease in the effective tax rate for the three months ended March 31, 2025, as compared to the prior period, is due to an increase in excess tax benefits related to stock incentive awards in the current year, a less significant impact from non-deductible business expenses, liabilities for uncertain tax positions and state taxes, partially offset by a less significant impact from research tax credit benefits.
The effective income tax rates for the periods presented are different from the statutory United States federal income tax rate of 21% primarily due to the tax benefits of research tax credits and excess tax benefits related to stock incentive awards, offset by state income taxes, liabilities for uncertain tax positions, and non-deductible business expenses.
We received income tax refunds, net of taxes paid, of $323,000 and $680,000 in the three months ended March 31, 2025, and March 31, 2024, respectively.