Income Taxes	9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our effective income tax rate was 31.0% and 37.6% for the three months ended September 30, 2018 and 2017, respectively. Our effective income tax rate was 25.8% and 34.6% for the nine months ended September 30, 2018 and 2017, respectively. The decrease, compared to the same periods in 2017, was primarily due to a lower U.S. effective tax rate, as a result of U.S. tax reform, a change in valuation allowance established against deferred tax assets related to capital losses recorded in 2017, a release of reserves for uncertain tax positions and changes in pretax mix across jurisdictions with disparate tax rates, partially offset by an increase in current year accruals for uncertain tax positions and a decrease in excess tax deductions on equity compensation. The total amount of unrecognized tax benefits as of September 30, 2018 was $11.9 million, of which $10.4 million would affect our effective tax rate if recognized. It is reasonably possible that approximately $3.6 million of our unrecognized tax benefits as of September 30, 2018 will reverse within the next twelve months. We recognize interest and penalties related to unrecognized tax benefits through income tax expense. As of September 30, 2018, we had $0.8 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 2013.

Income Taxes

Our effective income tax rate was 31.0% and 37.6% for the three months ended September 30, 2018 and 2017, respectively. Our effective income tax rate was 25.8% and 34.6% for the nine months ended September 30, 2018 and 2017, respectively. The decrease, compared to the same periods in 2017, was primarily due to a lower U.S. effective tax rate, as a result of U.S. tax reform, a change in valuation allowance established against deferred tax assets related to capital losses recorded in 2017, a release of reserves for uncertain tax positions and changes in pretax mix across jurisdictions with disparate tax rates, partially offset by an increase in current year accruals for uncertain tax positions and a decrease in excess tax deductions on equity compensation.

The total amount of unrecognized tax benefits as of September 30, 2018 was $11.9 million, of which $10.4 million would affect our effective tax rate if recognized. It is reasonably possible that approximately $3.6 million of our unrecognized tax benefits as of September 30, 2018 will reverse within the next twelve months.

We recognize interest and penalties related to unrecognized tax benefits through income tax expense. As of September 30, 2018, we had $0.8 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 2013.