Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our effective income tax rate was 8.1% and 18.6% for the three months ended September 30, 2020 and 2019, respectively. The decrease from the third quarter of 2019 was primarily due to the beneficial impact of changes in valuation allowance related to research and development (R&D) credits, partially offset by the increase in current quarter accruals of reserves for uncertain tax positions, higher tax impact on unremitted foreign earnings and profits, and changes in pretax mix across jurisdictions with disparate tax rates. Our effective income tax rate was 23.1% and 18.5% for the nine months ended September 30, 2020 and 2019, respectively. The increase from the first nine months of 2019 was primarily due to the increase in current quarter accruals of reserves for uncertain tax positions, the decrease in excess tax deductions on stock-based compensation and higher tax impact on unremitted foreign earnings and profits, partially offset by the beneficial impact of changes in valuation allowance related to R&D credits and pretax mix across jurisdictions with disparate tax rates. The total amount of unrecognized tax benefits as of September 30, 2020 was $14.9 million, of which $14.5 million would affect our effective tax rate if recognized. We recognize interest and penalties related to unrecognized tax benefits through income tax expense. As of September 30, 2020, we had $1.1 million accrued for the payment of interest. We are subject to taxation in the U.S. and various state and foreign jurisdictions. With few exceptions, we are no longer subject to examinations by tax authorities for years prior to 2015.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.