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Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Taxes
Income Taxes	Note 8.  Income Taxes ​ Our effective income tax rates for the second quarter and six months ended June 30, 2021 were 25.6% and 25.5%, respectively, compared to 20.9% and 22.4% in the same 2020 periods, respectively. The increase in our effective income tax rates were mainly due to the significant increases in our profitability in 2021. 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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