Income Taxes	6 Months Ended
Jun. 29, 2013
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 32.2% and 30.6% for the first six months of 2013 and 2012, respectively. This increase was primarily due to a decrease in net favorable discrete items recorded in 2013 relative to 2012, partially offset by reinstatement of the research and development credit in 2013. In January 2013, the American Taxpayer Relief Act of 2012 (Act) became law. The Act reinstates the research and development tax credit retroactively from January 1, 2012 to December 31, 2013. In the first quarter of 2013, we recognized the research and development tax credit related to 2012 as a favorable discrete item. Research and development tax credits generated in 2013 are being recognized pro-rata as a component of the overall 2013 effective tax rate.

Income Taxes

6 Months Ended

Jun. 29, 2013

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 32.2% and 30.6% for the first six months of 2013 and 2012, respectively. This increase was primarily due to a decrease in net favorable discrete items recorded in 2013 relative to 2012, partially offset by reinstatement of the research and development credit in 2013.

In January 2013, the American Taxpayer Relief Act of 2012 (Act) became law. The Act reinstates the research and development tax credit retroactively from January 1, 2012 to December 31, 2013. In the first quarter of 2013, we recognized the research and development tax credit related to 2012 as a favorable discrete item. Research and development tax credits generated in 2013 are being recognized pro-rata as a component of the overall 2013 effective tax rate.