Income Taxes	3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective income tax rates were 17.5% and 17.6% for the three months ended March 31, 2019 and 2018, respectively. The effective income tax rate for the three months ended March 31, 2019 was lower than the U.S. federal income tax rate of 21% primarily due to $2.0 million of excess tax benefits from share-based compensation and the impact of foreign operations, partially offset by state income taxes. The effective income tax rate for the three months ended March 31, 2018 was lower than the U.S. federal income tax rate of 21% primarily due to $1.6 million of excess tax benefits from share-based compensation and the impact of foreign operations, partially offset by state income taxes.

Income Taxes

3 Months Ended

Mar. 31, 2019

The effective income tax rates were 17.5% and 17.6% for the three months ended March 31, 2019 and 2018, respectively. The effective income tax rate for the three months ended March 31, 2019 was lower than the U.S. federal income tax rate of 21% primarily due to $2.0 million of excess tax benefits from share-based compensation and the impact of foreign operations, partially offset by state income taxes. The effective income tax rate for the three months ended March 31, 2018 was lower than the U.S. federal income tax rate of 21% primarily due to $1.6 million of excess tax benefits from share-based compensation and the impact of foreign operations, partially offset by state income taxes.