Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Tax Examination, Description			If management is highly confident that the position will be allowed and there is a greater than 50% likelihood that the full amount of the tax position will be ultimately realized, the company recognizes the full benefit associated with the tax position
Effective Income Tax Rate Reconciliation, Tax Credits	3.73%	5.12%	2.31%	4.58%
Income Tax Examination, Interest Accrued	$ 0.1		$ 0.1