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Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Mar. 31, 2012	Mar. 31, 2011
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Effective Income Tax Rate, Continuing Operations	7.70%	83.20%
Effective Tax Rate	15.00%	13.80%
Impact of certain receipts charges	7.30%	(69.40%)

- 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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