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Income Taxes (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Effective income tax rate continuing operation (as a percent) 30.90% 27.30% 30.90% 16.50%
Previously reported
        
Effective income tax rate continuing operation (as a percent)       30.60%
Immaterial correction of a prior period error
        
Amount of an immaterial correction of a prior period error, income tax       $ 371,000