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Income Taxes
3 Months Ended
Mar. 31, 2012
Income Taxes [Abstract]  
Income Taxes
8.
Income Taxes

The effective income tax rates for the three months ended March 31, 2012 and 2011, were 31.3% and 31.8%, respectively. The effective tax rates in both 2012 and 2011 were reduced by changes in estimates associated with the finalization of prior year tax items.