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Income Taxes (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Effective income tax rate continuing operation (as a percent) | 33.00% | 30.90% | 31.90% | (78.90%)
Previously reported |  |  |  |
Effective income tax rate continuing operation (as a percent) |  |  |  | 18.90%
Immaterial correction of a prior period error |  |  |  |
Amount of an immaterial correction of a prior period error, income tax |  |  |  | $ 371,000

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