Income Taxes

3 Months Ended

Mar. 31, 2012

Income Tax Expense (Benefit) [Abstract]

Income Taxes

Income Taxes

As of March 31, 2012, there were no significant changes to the Company's unrecognized tax benefits as reported in its Form 10-K for the year ended December 31, 2011.

The Company's income tax expense and resulting effective tax rate are based upon the respective estimated annual effective tax rates applicable for the respective periods adjusted for the effects of items required to be treated as discrete to the period, including changes in tax laws, changes in estimated exposures for uncertain tax positions, and other items. The Company's effective tax rate for the three months ended March 31, 2012 was favorably impacted by a change in the geographical mix in earnings.