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Income Taxes
3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Income Taxes INCOME TAXES

Our effective tax rate was 24 percent and 20 percent for the three-month periods ended March 31, 2019 and 2018, respectively. The increase in the tax rate was primarily due to an additional $10 million income tax benefit on stock-based compensation in the first quarter of 2018.