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Income Taxes
3 Months Ended
Mar. 31, 2015
Income Tax Disclosure [Abstract]  
Income Taxes
12. Income Taxes

The effective income tax rates for the three months ended March 31, 2015 and 2014 were 34.2% and 31.8%, respectively. The effective income tax rate in 2015 was unfavorably impacted by adjustments made to the Company’s unrecognized tax benefits related to the anticipated settlement of the Internal Revenue Service examination for the 2010 and the nine months ended September 30, 2011 tax years. The effective income tax rate in 2014 was favorably impacted by the tax benefit related to stock-based compensation.

It is reasonably possible that, within the next 12 months, total unrecognized tax benefits may decrease in the range of $4 million to $8 million, primarily as a result of the conclusion of pending U.S. federal, state and foreign income tax proceedings.