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Income Taxes (Details)
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3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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| Income Tax Disclosure [Abstract] | ||||
| Effective income tax rates | 29.50% | 33.40% | 33.10% | 33.60% |