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Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Mar. 31, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Effective tax rate	21.00%	38.00%
Expected effective income tax rate for entire year	32.00%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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