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Income Taxes
6 Months Ended
Jun. 30, 2012
Income Taxes [Abstract]  
Income Taxes
8.  
Income Taxes

The effective income tax rates for the quarters ended June 30, 2012 and 2011 were 30.1% and 31.9%, respectively. For the six months ended June 30, 2012 and 2011, the effective income tax rates were 30.7% and 31.9%, respectively. The effective tax rates in both 2012 and 2011 were reduced by changes in estimates associated with the finalization of prior year foreign and domestic tax items. In addition, the 2012 rate in the quarter and six-month period includes a change in estimate of the Company's current year effective tax rate.