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Income Taxes
6 Months Ended
Jun. 30, 2019
Income Taxes  
Income Taxes

Note 8.  Income Taxes

Our effective income tax rates for the three months and six months ended June 30, 2019 were 25% compared to 24% in the three months and six months ended June 30, 2018. The differences between our effective income tax rates and the U.S. federal statutory rate of 21% were mainly due to state income taxes partially offset by the effects of company-owned life insurance policies.