Income Taxes	3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company is subject to U.S. federal, state, and foreign income taxes. The Company's effective tax rate was 15.6% and 18.3% for the three months ended March 31, 2019 and 2018, respectively. The Company's effective tax rate for the three months ended March 31, 2019 was positively impacted, compared to the U.S. federal statutory rate, primarily by the federal tax credit for research activities, stock-based compensation, the foreign-derived intangible income deduction, and income earned in foreign jurisdictions with tax rates lower than the U.S. federal statutory rate. The Company's effective tax rate for the three months ended March 31, 2018 was positively impacted, compared to the U.S. federal statutory rate, primarily by the foreign-derived intangible income deduction and the federal tax credit for research activities.

Income Taxes

3 Months Ended

Mar. 31, 2019

The Company is subject to U.S. federal, state, and foreign income taxes. The Company's effective tax rate was 15.6% and 18.3% for the three months ended March 31, 2019 and 2018, respectively. The Company's effective tax rate for the three months ended March 31, 2019 was positively impacted, compared to the U.S. federal statutory rate, primarily by the federal tax credit for research activities, stock-based compensation, the foreign-derived intangible income deduction, and income earned in foreign jurisdictions with tax rates lower than the U.S. federal statutory rate. The Company's effective tax rate for the three months ended March 31, 2018 was positively impacted, compared to the U.S. federal statutory rate, primarily by the foreign-derived intangible income deduction and the federal tax credit for research activities.