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Income Taxes (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Taxes    
Effective tax rate (as a percent) 30.40% 36.00%
Reduction of tax expense due to changes in applicable tax law $ 135,000  
Effective tax rate excluding the effect of the change in applicable tax law (as a percent) 35.00%