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Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Taxes (Textual) [Abstract]
Unreserved portion of deferred tax assets	$ 13.9		$ 13.9
Effective income tax rates	25.70%	27.60%	27.10%	27.20%
Unrecognized tax benefits	$ 1.4		$ 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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