Income Taxes	9 Months Ended
Sep. 30, 2012
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective income tax rate, including discrete items, was 39.4% and 35.7% for the nine months ended September 30, 2012 and 2011, respectively. The effective income tax rate is based upon estimated income for the year, the estimated composition of the income in different jurisdictions and discrete adjustments, if any, in the applicable quarterly periods including settlements of tax audits or assessments, the resolution or identification of tax position uncertainties and acquisitions of other companies. The discrete items include the tax effect of certain stock options, interest and penalties related to uncertain tax positions, and return to provision adjustments. For each of the nine months ended September 30, 2012 and September 30, 2011, the effective income tax rate was higher than the federal statutory tax rate mainly due to the effect of accounting for stock-based compensation in accordance with the authoritative guidance for share-based payments and state income tax expense.

Income Taxes

9 Months Ended

Sep. 30, 2012

The Company’s effective income tax rate, including discrete items, was 39.4% and 35.7% for the nine months ended September 30, 2012 and 2011, respectively. The effective income tax rate is based upon estimated income for the year, the estimated composition of the income in different jurisdictions and discrete adjustments, if any, in the applicable quarterly periods including settlements of tax audits or assessments, the resolution or identification of tax position uncertainties and acquisitions of other companies. The discrete items include the tax effect of certain stock options, interest and penalties related to uncertain tax positions, and return to provision adjustments. For each of the nine months ended September 30, 2012 and September 30, 2011, the effective income tax rate was higher than the federal statutory tax rate mainly due to the effect of accounting for stock-based compensation in accordance with the authoritative guidance for share-based payments and state income tax expense.