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Income Taxes
 3 Months Ended
Mar. 31, 2023
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The following table presents our income tax provision and our income tax rate for the three months ended March 31, 2023 and 2022 (in thousands, except percentages):
 For the three months ended
March 31,
 20232022
Income tax provision$41,331 $26,451 
Income tax rate27.0 %26.5 %
The difference between the U.S. statutory tax rate of 21% and our effective income tax rate for both the three months ended March 31, 2023 and 2022 was primarily a result of state and local income taxes and other permanent book-to-tax differences.
The increase in our income tax provision for the three months ended March 31, 2023, when compared to the three months ended March 31, 2022, was due to: (a) greater income before income taxes, and (b) an increase in our effective income tax rate. The change in our effective income tax rate was attributable to an increase in certain permanent book-to-tax differences, including the impact of the expiration of specific provisions within the Consolidated Appropriations Act, 2021, which allowed for a 100% tax deduction for business meals in 2022. For periods after December 31, 2022, the tax deduction for business meals has been reduced to 50%.
As of March 31, 2023 and December 31, 2022, we had no unrecognized income tax benefits.
We file a consolidated federal income tax return including all of our U.S. subsidiaries with the Internal Revenue Service. We additionally file income tax returns with various state, local, and foreign tax agencies. Our income tax returns are subject to audit by various taxing authorities and are currently under examination for the years 2017 through 2020.