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Income Taxes
 6 Months Ended
Jun. 30, 2023
Income Taxes [Abstract]  
Income Taxes 8. Income Taxes

The effective income tax rate for the three months ended June 30, 2023, was 23.8%, a decrease from an effective income tax rate of 25.3% for the three months ended June 30, 2022. The decrease is primarily due to an increase in tax benefits related to option exercises and equity vesting, partially offset with an increase in uncertain tax position reserves.

The effective income tax rate for the six months ended June 30, 2023, was 23.2%, an increase from an effective income tax rate of 22.3% for the six months ended June 30, 2022. The increase is primarily due to a decrease in tax benefits related to option exercises and equity vesting and an increase in uncertain tax position reserves, partially offset by a reduction in nondeductible expenses.