Income Taxes	9 Months Ended
Sep. 30, 2017
Income Taxes	Income Taxes We manage our affairs so that we are centrally managed and controlled in the U.K. and therefore have our tax residency in the U.K. The provision for income taxes consists of provisions for U.K. and international income taxes. We operate in an international environment with operations in various locations outside the U.K. Accordingly, the consolidated income tax rate is a composite rate reflecting the earnings in the various locations and the applicable rates. The effective income tax rate for the nine months ended September 30, 2017 was 24.3%, compared to 21.5% for 2016. We continue to actively pursue initiatives to reduce our effective tax rate. The tax rate in any quarter can be affected positively or negatively by adjustments that are required to be reported in the specific quarter of resolution. The liability for uncertain tax positions was $36.8 million and $71.1 million at September 30, 2017 and December 31, 2016, respectively. The $34.3 million reduction in uncertain tax positions between December 31, 2016 and September 30, 2017 is primarily due to the settlement of tax controversies with the Internal Revenue Service and the payment of resulting tax liabilities. We record penalties and interest related to unrecognized tax benefits in Provision for income taxes and Net interest expense, respectively, on the Condensed Consolidated Statements of Operations and Comprehensive Income (Loss), which is consistent with our past practices.

Income Taxes

We manage our affairs so that we are centrally managed and controlled in the U.K. and therefore have our tax residency in the U.K. The provision for income taxes consists of provisions for U.K. and international income taxes. We operate in an international environment with operations in various locations outside the U.K. Accordingly, the consolidated income tax rate is a composite rate reflecting the earnings in the various locations and the applicable rates.

The effective income tax rate for the nine months ended September 30, 2017 was 24.3%, compared to 21.5% for 2016. We continue to actively pursue initiatives to reduce our effective tax rate. The tax rate in any quarter can be affected positively or negatively by adjustments that are required to be reported in the specific quarter of resolution.

The liability for uncertain tax positions was $36.8 million and $71.1 million at September 30, 2017 and December 31, 2016, respectively. The $34.3 million reduction in uncertain tax positions between December 31, 2016 and September 30, 2017 is primarily due to the settlement of tax controversies with the Internal Revenue Service and the payment of resulting tax liabilities. We record penalties and interest related to unrecognized tax benefits in Provision for income taxes and Net interest expense, respectively, on the Condensed Consolidated Statements of Operations and Comprehensive Income (Loss), which is consistent with our past practices.