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Income Taxes
 6 Months Ended
Jun. 30, 2022
Income Taxes [Abstract]  
Income Taxes 7. Income Taxes

The effective income tax rate for the three months ended June 30, 2022, was 25.3%, an increase from an effective income tax rate of 23.7% for the three months ended June 30, 2021. The increase in rate is primarily due to fewer tax benefits related to option exercises and equity vesting during the three months ended June 30, 2022 compared to the three months ended June 30, 2021.

The effective income tax rate was 22.3% for both the six months ended June 30, 2022 and the six months ended June 30, 2021. The increase in rate due to fewer tax benefits from option exercises and equity vesting during the six months ended June 30, 2022 compared to the six months ended June 30, 2021, was offset by a decrease in rate primarily from fewer nondeductible expenses and penalties in the current year.