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Income Taxes	3 Months Ended
	Mar. 31, 2021
Income Taxes
Income Taxes	Note 8.  Income Taxes ​ Our effective income tax rates for the first quarters of 2021 and 2020 were 25.3% and 24.3%, respectively. The increase in our effective income tax rate was mainly due to our higher income levels. The differences between our effective income tax rates and the U.S. federal statutory rate of 21.0% were mainly due to state income taxes partially offset by the effects of company-owned life insurance policies. ​

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The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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