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Income Taxes
 9 Months Ended
Sep. 30, 2012
Income Tax Disclosure [Abstract]  
Income Taxes
Income Taxes
Provision for income taxes was $34.4 million resulting in an effective tax rate of 25.4 percent compared to expense of $29.8 million resulting in an effective tax rate of 23.5 percent for the three months ended September 30, 2012 and 2011, respectively. The increase in the effective tax rate was primarily associated with tax benefit adjustments recognized in 2011 for prior year tax matters that did not repeat in 2012.
Provision for income taxes was $124.5 million resulting in an effective tax rate of 26.2 percent compared to expense of $96.1 million resulting in an effective tax rate of 22.9 percent for the nine months ended September 30, 2012 and 2011, respectively. The increase in the effective tax rate was primarily a result of a reduction recorded in 2011 in our liability for unrecognized tax benefits of approximately $14.1 million as a result of settlements of audits and benefits recognized in 2011 that did not repeat in 2012.