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Income Taxes (Notes)
6 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]  
Income Taxes
9. Income Taxes

For interim reporting periods, the Company’s provision for income taxes is calculated using its annualized estimated effective tax rate for the year. This rate is based on its estimated full-year income and the related income tax expense for each jurisdiction in which the Company operates. Changes in the geographical mix, permanent differences or the estimated level of annual pre-tax income, can affect the effective tax rate. This rate is adjusted for the effects of discrete items occurring in the period.