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Income Taxes
9 Months Ended
Sep. 30, 2011
Income Taxes 
Income Taxes

NOTE 3—Income Taxes:

The effective income tax rate for the three- and nine-month periods ended September 30, 2011 was 25.1% and 23.7%, respectively, compared to 24.1% and 24.0% for the three- and nine-month periods ended September 30, 2010, respectively. The Company's effective income tax rate fluctuates based on, among other factors, our level and location of income. The difference between the U.S. federal statutory income tax rate and our effective income tax rate for the 2011 and 2010 periods is mainly due to the impact of earnings from outside the U.S.