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Income Taxes
3 Months Ended
Mar. 31, 2013
Income Taxes [Abstract]  
Income Taxes
8.  
Income Taxes

The effective income tax rates for the three months ended March 31, 2013 and 2012, were ­­33.2% and 31.3%, respectively. The effective tax rates in both 2013 and 2012 were reduced by changes in estimates associated with the finalization of prior year tax items. The 2013 tax rate was also increased by the 2013 restructuring charge.