Income Taxes	9 Months Ended
Sep. 30, 2013
Income Taxes [Abstract]
Income Taxes	Note 10. Income Taxes The Company's combined effective income tax rate on continuing operations was 34.6% and 30.7% for the three-month periods ended September 30, 2013 and 2012, respectively. The Company's combined effective income tax rate on continuing operations was 33.4% and 35.9% for the nine-month periods ended September 30, 2013 and 2012, respectively. The Company's effective tax rate for the three-month period ended September 30, 2013 includes the effect of state income taxes and other discrete items as well as a benefit for tax credits on third quarter 2013 research and development tax expenditures. The Company's effective tax rate for the nine-month period ended September 30, 2013 includes the effect of state income taxes and other discrete items as well as a benefit for tax credits for research and development tax expenditures during both the first nine months of 2013 and all of the fiscal year 2012, as legislation extending the research and development credit for both 2012 and 2013 was not enacted by Congress until January 2013. The Company's effective tax rate for the three and nine-month periods ended September 30, 2012 did not include a benefit for research and development tax credits. The Company's liability recorded for uncertain tax positions as of September 30, 2013 has changed significantly in composition since December 31, 2012 due to the settlement of an income tax audit for tax years 2006, 2007, and 2008.

Income Taxes

9 Months Ended

Sep. 30, 2013

Note 10. Income Taxes

The Company's combined effective income tax rate on continuing operations was 34.6% and 30.7% for the three-month periods ended September 30, 2013 and 2012, respectively. The Company's combined effective income tax rate on continuing operations was 33.4% and 35.9% for the nine-month periods ended September 30, 2013 and 2012, respectively. The Company's effective tax rate for the three-month period ended September 30, 2013 includes the effect of state income taxes and other discrete items as well as a benefit for tax credits on third quarter 2013 research and development tax expenditures. The Company's effective tax rate for the nine-month period ended September 30, 2013 includes the effect of state income taxes and other discrete items as well as a benefit for tax credits for research and development tax expenditures during both the first nine months of 2013 and all of the fiscal year 2012, as legislation extending the research and development credit for both 2012 and 2013 was not enacted by Congress until January 2013. The Company's effective tax rate for the three and nine-month periods ended September 30, 2012 did not include a benefit for research and development tax credits.

The Company's liability recorded for uncertain tax positions as of September 30, 2013 has changed significantly in composition since December 31, 2012 due to the settlement of an income tax audit for tax years 2006, 2007, and 2008.