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Income Taxes
 9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes

8. Income Taxes

The effective income tax rates were 26.6% and 23.6% for the three months ended September 30, 2021 and 2020, respectively. The difference between our federal statutory and effective income tax rates is principally due to the inclusion of state taxes and non-deductible compensation partially offset by the use of federal employment tax credits.

The effective income tax rates were 24.7% and 20.5% for the nine months ended September 30, 2021 and 2020, respectively. For the nine months ended September 30, 2021, the difference between our federal statutory and effective income tax rates was principally due to the inclusion of state taxes and non-deductible compensation partially offset by the use of federal employment tax credits and excess tax benefit. For the nine months ended September 30, 2020, the difference between our federal statutory and effective income tax rates was principally due to the inclusion of an excess tax benefit and the use of federal employment tax credits partially offset by state taxes and non-deductible compensation. For the nine months ended September 30, 2021 and 2020, the effective tax rates were inclusive of an excess tax benefit of 2.1% and 6.8%, respectively. The excess tax benefit is a discrete item, related to the vesting of equity shares, which requires the Company to recognize the benefit fully in the period. An excess tax benefit results if the Company’s income tax deduction exceeds the cumulative costs of the award recognized on the Unaudited Condensed Consolidated Statements of Income.