Income Taxes	6 Months Ended
Jun. 30, 2012
Income Taxes [Abstract]
Income Taxes	Income Taxes Our effective income tax rates were 35.0% and 33.1% for the six and three months ended June 30, 2012 and 33.7% and 33.9% for the same periods in the prior year. The effective tax rate for the six months ended June 30, 2012 is higher than the comparable prior year period primarily due to U.S. research and development tax credits that existed in 2011, but do not exist in 2012. The effective tax rate for the three months ended June 30, 2012 is lower than the comparable prior year period primarily due to discrete tax adjustments partially offset by research and development benefits that existed in 2011, but do not exist in 2012. If Congress extends the research and development credit there will be a favorable impact on our 2012 effective income tax rate. During the first quarter of 2012 we filed an appeal with the IRS for the 2007-2008 tax years. The 2009-2010 IRS audit began in the second quarter of 2012. We are also subject to examination in major state and international jurisdictions for the 2001-2011 tax years. We believe appropriate provisions for all outstanding tax issues have been made for all jurisdictions and all open years.

Income Taxes

6 Months Ended

Jun. 30, 2012

Our effective income tax rates were 35.0% and 33.1% for the six and three months ended June 30, 2012 and 33.7% and 33.9% for the same periods in the prior year. The effective tax rate for the six months ended June 30, 2012 is higher than the comparable prior year period primarily due to U.S. research and development tax credits that existed in 2011, but do not exist in 2012. The effective tax rate for the three months ended June 30, 2012 is lower than the comparable prior year period primarily due to discrete tax adjustments partially offset by research and development benefits that existed in 2011, but do not exist in 2012. If Congress extends the research and development credit there will be a favorable impact on our 2012 effective income tax rate.

During the first quarter of 2012 we filed an appeal with the IRS for the 2007-2008 tax years. The 2009-2010 IRS audit began in the second quarter of 2012. We are also subject to examination in major state and international jurisdictions for the 2001-2011 tax years. We believe appropriate provisions for all outstanding tax issues have been made for all jurisdictions and all open years.