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Income Taxes (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Taxes          
Effective tax rate (as a percent) 35.00%   36.00% 33.20% 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%