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Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2012
Income Taxes [Abstract]
Income Taxes	Note 10. Income Taxes The Company's combined effective income tax rate was 36.6% and 33.8% for the three-month periods ended June 30, 2012 and 2011, respectively. The Company's combined effective income tax rate was 37.0% and 34.3% for the six-month periods ended June 30, 2012 and 2011, respectively. The Company's effective tax rate for the three and six-month periods ended June 30, 2012 includes the effect of state income taxes and other discrete items but does not include a benefit for research and development tax credits as legislation extending the research and development credit to 2012 has not been enacted by Congress as of June 30, 2012. The Company's effective tax rate for the three and six-month periods ended June 30, 2011 included a benefit for research and development tax credits. The Company's liability recorded for uncertain tax positions as of June 30, 2012 has not changed significantly in amount or composition since December 31, 2011.

Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions.

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