Income Taxes	3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company calculates its interim income tax provision in accordance with Accounting Standards Codification (“ASC”) 270, Interim Reporting, and ASC 740, Accounting for Income Taxes (together, “ASC 740”). At the end of each interim period, the Company estimates its annual effective tax rate and applies that rate to its ordinary quarterly earnings to calculate the tax related to ordinary income. The tax effects for other items that are excluded from ordinary income are discretely calculated and recognized in the period in which they occur. On December 22, 2017, the Tax Cuts and Jobs Act (the “Tax Act”) was enacted into legislation, which includes a broad range of provisions affecting businesses. The Tax Act significantly revised how companies compute their U.S. corporate tax liability by, among other provisions, reducing the corporate tax rate from 35% to 21% for tax years beginning after December 31, 2017, implementing a territorial tax system, and requiring a mandatory one-time tax on U.S.-owned undistributed foreign earnings and profits known as the transition tax. The Company recognized income tax expense of $1.7 million and $4.7 million for the three months ended March 31, 2019 and 2018, respectively. The Company’s 6% effective tax rate for the three months ended March 31, 2019 differed from the federal statutory rate of 21% due to the discrete impact of excess tax deductions from stock-based compensation and the benefit from corporate deductions attributable to Foreign Derived Intangible Income (“FDII”). The Company’s 12% effective tax rate for the three months ended March 31, 2018 differed from the federal statutory rate of 21% due to the projected impact to the Company’s valuation allowance from utilization of deferred tax assets shielding its tax liability, the tax benefit recorded for excess tax benefits of stock-based compensation, and the benefit from corporate deduction attributable to FDII. The Company is subject to periodic audits by domestic and foreign tax authorities. Due to the carryforward of unutilized credit carryovers, the Company’s federal tax years from 2009 and forward are subject to examination by the U.S. authorities. The Company’s state and foreign tax years for 2001 and forward are subject to examination by applicable tax authorities. The Company believes that it has appropriate support for the income tax positions taken on its tax returns and that its accruals for tax liabilities are adequate for all open years based on an assessment of many factors, including past experience and interpretations of tax laws applied to the facts of each matter.

Income Taxes

The Company calculates its interim income tax provision in accordance with Accounting Standards Codification (“ASC”) 270, Interim Reporting, and ASC 740, Accounting for Income Taxes (together, “ASC 740”). At the end of each interim period, the Company estimates its annual effective tax rate and applies that rate to its ordinary quarterly earnings to calculate the tax related to ordinary income. The tax effects for other items that are excluded from ordinary income are discretely calculated and recognized in the period in which they occur.

On December 22, 2017, the Tax Cuts and Jobs Act (the “Tax Act”) was enacted into legislation, which includes a broad range of provisions affecting businesses. The Tax Act significantly revised how companies compute their U.S. corporate tax liability by, among other provisions, reducing the corporate tax rate from 35% to 21% for tax years beginning after December 31, 2017, implementing a territorial tax system, and requiring a mandatory one-time tax on U.S.-owned undistributed foreign earnings and profits known as the transition tax.

The Company recognized income tax expense of $1.7 million and $4.7 million for the three months ended March 31, 2019 and 2018, respectively. The Company’s 6% effective tax rate for the three months ended March 31, 2019 differed from the federal statutory rate of 21% due to the discrete impact of excess tax deductions from stock-based compensation and the benefit from corporate deductions attributable to Foreign Derived Intangible Income (“FDII”). The Company’s 12% effective tax rate for the three months ended March 31, 2018 differed from the federal statutory rate of 21% due to the projected impact to the Company’s valuation allowance from utilization of deferred tax assets shielding its tax liability, the tax benefit recorded for excess tax benefits of stock-based compensation, and the benefit from corporate deduction attributable to FDII.

The Company is subject to periodic audits by domestic and foreign tax authorities. Due to the carryforward of unutilized credit carryovers, the Company’s federal tax years from 2009 and forward are subject to examination by the U.S. authorities. The Company’s state and foreign tax years for 2001 and forward are subject to examination by applicable tax authorities. The Company believes that it has appropriate support for the income tax positions taken on its tax returns and that its accruals for tax liabilities are adequate for all open years based on an assessment of many factors, including past experience and interpretations of tax laws applied to the facts of each matter.