Income Taxes	6 Months Ended
Jun. 30, 2019
Income Taxes [Abstract]
Income Taxes	9. Income Taxes The effective income tax rates for the three months ended June 30, 2019 and 2018, were 18.6% and 16.1%, respectively. For the six months ended June 30, 2019 and 2018, the effective income tax rates were 22.1% and 20.1%, respectively. The effective tax rates in both 2019 and 2018 were impacted by changes in estimates associated with the finalization of prior year foreign and domestic tax items, audit settlements, and the mix of foreign earnings. In addition, the 2019 effective tax rate was impacted by an adjustment to a valuation allowance, and the 2018 effective tax rate was impacted by the U.S. tax accounting method changes that were filed with the IRS.

Income Taxes

6 Months Ended

Jun. 30, 2019

9. Income Taxes

The effective income tax rates for the three months ended June 30, 2019 and 2018, were 18.6% and 16.1%, respectively. For the six months ended June 30, 2019 and 2018, the effective income tax rates were 22.1% and 20.1%, respectively. The effective tax rates in both 2019 and 2018 were impacted by changes in estimates associated with the finalization of prior year foreign and domestic tax items, audit settlements, and the mix of foreign earnings. In addition, the 2019 effective tax rate was impacted by an adjustment to a valuation allowance, and the 2018 effective tax rate was impacted by the U.S. tax accounting method changes that were filed with the IRS.