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Income Taxes: Effective tax rate (Details)	9 Months Ended
Income Taxes: Effective tax rate (Details)	Sep. 30, 2013	Sep. 30, 2012
Income Tax Contingency [Line Items]
Effective Income Tax Rate	30.00%	33.00%

- 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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