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Income Taxes (Details Textual) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes (Textual) [Abstract]
Amount of unrecognized tax benefits	$ 1,279,000	$ 1,279,000	$ 1,417,000
Amount accrued for payment of interest	$ 298,000	$ 211,000

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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