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Income Tax Provision
 6 Months Ended
Jun. 30, 2022
Income Tax Disclosure [Abstract]  
Income Tax Provision Income Tax Provision
We had an effective income tax rate of 21.3% and 21.8% for the three and six months ended June 30, 2022, respectively, compared to 2.2% and 2.9% for the three and six months ended June 30, 2021, respectively. The increase in the effective tax rates for the three and six months ended June 30, 2022, respectively, as compared to the same period in 2021, was principally driven by a decrease in the excess tax benefits related to stock incentive awards and an increase in reserves for state income tax benefits which are no longer more likely than not to be realized.
The effective income tax rates for the periods presented were different from the statutory United States federal income tax rate of 21% primarily due to excess tax benefits related to stock incentive awards and the tax benefit of research tax credits, offset by state income taxes, non-deductible business expenses, and reserves for unrecognized state income tax benefits. The excess tax benefits related to stock incentive awards realized were $1.7 million and $4.7 million for the three and six months ended June 30, 2022, respectively, as compared to $6.4 million and $15.2 million for the three and six months ended June 30, 2021, respectively. Excluding the excess tax benefits, the effective tax rate was 24.6% and 26.4% for the three and six months ended June 30, 2022, respectively, compared to 26.7% and 26.5% for the three and six months ended June 30, 2021, respectively.
We made tax payments of $24.3 million and $967,000 in the six months ended June 30, 2022, and 2021, respectively.