Income Taxes	3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our effective tax rate may vary from the U.S. federal statutory tax rate due to the change in the mix of earnings in tax jurisdictions with different statutory rates, benefits related to tax credits, and the tax impact of non-deductible expenses and other permanent differences between income before income taxes and taxable income. The effective tax rate for the three months ended March 31, 2019 was 3.9%. For the three months ended March 31, 2019, the decrease from the U.S. federal statutory tax rate of 21% was primarily attributable to a discrete tax benefit related to uncertain tax positions, the mix of earnings in jurisdictions with lower statutory tax rates than the U.S. federal statutory tax rate, such as in Singapore and the United Kingdom, and excess tax benefits related to share-based compensation.

Income Taxes

3 Months Ended

Mar. 31, 2019

Our effective tax rate may vary from the U.S. federal statutory tax rate due to the change in the mix of earnings in tax jurisdictions with different statutory rates, benefits related to tax credits, and the tax impact of non-deductible expenses and other permanent differences between income before income taxes and taxable income. The effective tax rate for the three months ended March 31, 2019 was 3.9%. For the three months ended March 31, 2019, the decrease from the U.S. federal statutory tax rate of 21% was primarily attributable to a discrete tax benefit related to uncertain tax positions, the mix of earnings in jurisdictions with lower statutory tax rates than the U.S. federal statutory tax rate, such as in Singapore and the United Kingdom, and excess tax benefits related to share-based compensation.