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Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income Taxes (Textual) [Abstract]
Unreserved portion of deferred tax assets	$ 12.9
Effective income tax rates	28.90%	24.60%
Effective tax rate excluding valuation allowance	25.20%
Unrecognized tax benefits	$ 1.4

- 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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