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Income Taxes
9 Months Ended
Sep. 30, 2014
Income Tax Disclosure [Abstract]  
Income Taxes
8. Income Taxes
The effective income tax rate was 32.8% for the three months ended September 30, 2014 compared to 38.7% for the three months ended September 30, 2013. The effective tax rate was 36.7% for the nine months ended September 30, 2014 compared to 38.7% for the nine months ended September 30, 2013. In determining the provision for income taxes, the Company used an estimated annual effective tax rate, which was based on expected annual income, statutory tax rates, and the Company's best estimate of non-deductible and non-taxable items of income and expense. Income tax expense varies from the amount computed by applying the federal corporate income tax rate of 35.0% to income before income taxes primarily due to state income taxes, net of federal income tax effect, and adjustments for permanent differences.