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Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes for the three months ended March 31, 2012 reflects an estimated annual effective tax rate of 27 percent. The provision for income taxes for the three months ended March 31, 2011 reflected an estimated annual effective tax rate of 26 percent.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

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+ Details