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Income Taxes
3 Months Ended
Mar. 31, 2021
Income Taxes [Abstract]  
Income Taxes (8) Income Taxes

The consolidated income tax expense for the three months ended March 31, 2021 and 2020, was determined based upon estimates of the Company’s consolidated annual effective income tax rate for the years ending December 31, 2021 and 2020, respectively. The difference between the consolidated annual effective income tax rate and the U.S. federal statutory rate is primarily attributable to foreign income taxes, state income taxes and the effect of certain permanent differences.

The Company’s estimated effective tax rate before discrete items was 7.1% at March 31, 2021, compared to an effective tax rate of 8.6% at March 31, 2020.