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Income Taxes
6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
Our effective income tax rate (ETR) for the six months ended June 30, 2021 and 2020 was 19 percent and 20 percent, respectively. Our ETR for the six months ended June 30, 2021 decreased compared to the ETR for the six months ended June 30, 2020 primarily due to a decrease in valuation allowance, partially offset by an increase in state tax expense.
We record interest and penalties related to uncertain tax positions as a component of income tax expense. As of June 30, 2021 and December 31, 2020, our total liability for unrecognized tax benefits, including related interest, was approximately $5.2 million and $4.9 million, respectively. The total amount of unrecognized tax benefits relating to our tax positions is subject to change based on future events and it is reasonably possible that the balance could change significantly over the next 12 months. Given the uncertainty of future events, we are unable to reasonably estimate the range of possible adjustments to the balance of our unrecognized tax benefits.