XML 28 R40.htm IDEA: XBRL DOCUMENT

Income Taxes (Details)	3 Months Ended		12 Months Ended
Income Taxes (Details)	Mar. 31, 2012 Year	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010 Year
Income Tax Disclosure [Abstract]
Effective tax rate	22.90%	24.20%	21.70%
Tax holiday award period, extension granted				2
Tax holiday award period minimum	7
Tax holiday award period maximum	9
Number of awards scheduled to expire in current year	2

- 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