Income Taxes (Notes)

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Income Taxes

10. Income Taxes

For interim reporting periods, the Company’s provision for income taxes is calculated using its annualized estimated effective tax rate for the year. This rate is based on its estimated full-year income and the related income tax expense for each jurisdiction in which the Company operates. Changes in the geographical mix, permanent differences or the estimated level of annual pre-tax income can affect the effective tax rate. This rate is adjusted for the effects of discrete items occurring in the period.

On January 1, 2017 the Company adopted ASU No. 2016-09, Stock Compensation (Topic 718) which requires excess tax benefits and deficiencies related to stock-based compensation to be recognized as income tax benefits or expense, while in prior years these excess tax benefits and deficiencies were treated as adjustments to stockholders equity. During the three and nine months endedSeptember 30, 2017, there were net excess tax benefits of $0.4 million and $2.0 million, respectively, related to stock-based compensation, which are treated as discrete items.