XML 17 R30.htm IDEA: XBRL DOCUMENT

Income Taxes: Effective tax rate (Details)	3 Months Ended
Income Taxes: Effective tax rate (Details)	Mar. 31, 2012	Mar. 31, 2011
Income Tax Contingency [Line Items]
Effective Income Tax Rate	34.00%	36.00%

- 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.

+ References+ Details