Income Taxes	3 Months Ended
Mar. 31, 2018
Income Taxes [Abstract]
Income Taxes	NOTE 11. INCOME TAXES Our effective income tax rate was 14.3% for the three months ended March 31, 2018, as compared to 18.5% for the three months ended March 31, 2017. The decrease in our effective tax rate was primarily related to the reduction in our U.S. statutory rate as a result of the 2017 Tax Act, partially offset by lower tax benefits related to share-based compensation, as compared to the same period in the prior year. As of December 31, 2017, we have accounted for the impacts of the 2017 Tax Act to the extent a reasonable estimate could be made and we recognized provisional amounts related to the deemed repatriation tax, offset by the remeasurement of our deferred tax assets and liabilities to record the effects of the tax law change in the period of enactment. This treatment is provided for in ASU 2018-05, which allows a company to record a provisional amount when it does not have the necessary information available, prepared, or analyzed in reasonable detail to complete its accounting for the change in the tax law during the measurement period. The measurement period ends when the company has obtained, prepared, and analyzed the information necessary to finalize its accounting, but cannot extend beyond one year. During the first quarter of 2018, the Internal Revenue Service issued additional guidance providing clarification on certain aspects of the deemed repatriation tax calculation. The additional guidance did not result in an adjustment to the provisional amounts recorded as of December 31, 2017. We will continue to monitor for new guidance related to provisional amounts recorded.

NOTE 11. INCOME TAXES

Our effective income tax rate was 14.3% for the three months ended March 31, 2018, as compared to 18.5% for the three months ended March 31, 2017. The decrease in our effective tax rate was primarily related to the reduction in our U.S. statutory rate as a result of the 2017 Tax Act, partially offset by lower tax benefits related to share-based compensation, as compared to the same period in the prior year.

As of December 31, 2017, we have accounted for the impacts of the 2017 Tax Act to the extent a reasonable estimate could be made and we recognized provisional amounts related to the deemed repatriation tax, offset by the remeasurement of our deferred tax assets and liabilities to record the effects of the tax law change in the period of enactment. This treatment is provided for in ASU 2018-05, which allows a company to record a provisional amount when it does not have the necessary information available, prepared, or analyzed in reasonable detail to complete its accounting for the change in the tax law during the measurement period. The measurement period ends when the company has obtained, prepared, and analyzed the information necessary to finalize its accounting, but cannot extend beyond one year. During the first quarter of 2018, the Internal Revenue Service issued additional guidance providing clarification on certain aspects of the deemed repatriation tax calculation. The additional guidance did not result in an adjustment to the provisional amounts recorded as of December 31, 2017. We will continue to monitor for new guidance related to provisional amounts recorded.