Income Taxes	3 Months Ended
Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our effective income tax rates were 25.9% and 30.0% for the three months ended March 31, 2017 and 2016. The effective tax rate for the three months ended March 31, 2017 is lower than the comparable prior year period primarily due to higher discrete tax benefits in the first quarter of 2017. The increase in discrete tax benefits was primarily driven by excess tax benefits from share-based payments attributable to increases in the company’s stock price, in combination with the annual vesting of restricted stock units and performance-based restricted stock units and higher stock option exercises. Federal income tax audits have been settled for all years prior to 2013. The Internal Revenue Service (IRS) began the 2013-2014 federal tax audit in the fourth quarter of 2016. We are also subject to examination in major state and international jurisdictions for the 2001-2016 tax years. We believe appropriate provisions for all outstanding tax issues have been made for all jurisdictions and all open years.

Income Taxes

3 Months Ended

Mar. 31, 2017

Our effective income tax rates were 25.9% and 30.0% for the three months ended March 31, 2017 and 2016. The effective tax rate for the three months ended March 31, 2017 is lower than the comparable prior year period primarily due to higher discrete tax benefits in the first quarter of 2017. The increase in discrete tax benefits was primarily driven by excess tax benefits from share-based payments attributable to increases in the company’s stock price, in combination with the annual vesting of restricted stock units and performance-based restricted stock units and higher stock option exercises.

Federal income tax audits have been settled for all years prior to 2013. The Internal Revenue Service (IRS) began the 2013-2014 federal tax audit in the fourth quarter of 2016. We are also subject to examination in major state and international jurisdictions for the 2001-2016 tax years. We believe appropriate provisions for all outstanding tax issues have been made for all jurisdictions and all open years.