Income Taxes	3 Months Ended
Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective income tax rate was 33.5% and 35.0% for the three months ended March 31, 2016 and 2015, respectively. The effective income tax rate is based on estimated income for the year, the estimated composition of the income in different jurisdictions and discrete adjustments, if any, in the applicable quarterly periods, including retroactive changes in tax legislation, settlements of tax audits or assessments, the resolution or identification of tax position uncertainties and acquisitions of other companies. For the three months ended March 31, 2016, the effective income tax rate was lower than the federal statutory tax rate due to the composition of income from foreign jurisdictions that is taxed at lower rates compared to the statutory tax rates in the U.S. and the U.S. federal, state and foreign research and development credits, partially offset by the effects of accounting for stock-based compensation in accordance with the authoritative guidance for share-based payments and state income taxes. For the three months ended March 31, 2015, the effective income tax rate equaled the federal statutory tax rate. The effects of accounting for stock-based compensation in accordance with the authoritative guidance for share-based payments and state income taxes caused the Company's tax rate to be higher than the federal statutory tax rate; however, those items were offset by the composition of income from foreign jurisdictions that is taxed at lower rates compared to the statutory tax rates in the U.S and the domestic production activities deduction.

Income Taxes

3 Months Ended

Mar. 31, 2016

The Company’s effective income tax rate was 33.5% and 35.0% for the three months ended March 31, 2016 and 2015, respectively. The effective income tax rate is based on estimated income for the year, the estimated composition of the income in different jurisdictions and discrete adjustments, if any, in the applicable quarterly periods, including retroactive changes in tax legislation, settlements of tax audits or assessments, the resolution or identification of tax position uncertainties and acquisitions of other companies.

For the three months ended March 31, 2016, the effective income tax rate was lower than the federal statutory tax rate due to the composition of income from foreign jurisdictions that is taxed at lower rates compared to the statutory tax rates in the U.S. and the U.S. federal, state and foreign research and development credits, partially offset by the effects of accounting for stock-based compensation in accordance with the authoritative guidance for share-based payments and state income taxes. For the three months ended March 31, 2015, the effective income tax rate equaled the federal statutory tax rate. The effects of accounting for stock-based compensation in accordance with the authoritative guidance for share-based payments and state income taxes caused the Company's tax rate to be higher than the federal statutory tax rate; however, those items were offset by the composition of income from foreign jurisdictions that is taxed at lower rates compared to the statutory tax rates in the U.S and the domestic production activities deduction.