Income Taxes	9 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We determine the tax provision for interim periods using an estimate of our annual effective tax rate, adjusted for discrete items, if any, that are taken into account in the relevant period. Each quarter we update our estimate of the annual effective tax rate, and if our estimated tax rate changes, we make a cumulative adjustment. Our effective tax rate was 28.9% and 30.7% for the first nine months of 2017 and 2016, respectively. The decrease in the effective tax rate in 2017 is primarily a result of the inclusion of net excess tax benefits as a discrete item within the tax provision, upon our adoption of ASU 2016-09 in the first quarter of 2017. Refer to Note (1) for further discussion regarding our adoption of ASU 2016-09 and its impact on our condensed consolidated financial statements.

Income Taxes

9 Months Ended

Sep. 30, 2017

We determine the tax provision for interim periods using an estimate of our annual effective tax rate, adjusted for discrete items, if any, that are taken into account in the relevant period. Each quarter we update our estimate of the annual effective tax rate, and if our estimated tax rate changes, we make a cumulative adjustment.

Our effective tax rate was 28.9% and 30.7% for the first nine months of 2017 and 2016, respectively. The decrease in the effective tax rate in 2017 is primarily a result of the inclusion of net excess tax benefits as a discrete item within the tax provision, upon our adoption of ASU 2016-09 in the first quarter of 2017. Refer to Note (1) for further discussion regarding our adoption of ASU 2016-09 and its impact on our condensed consolidated financial statements.