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Income Taxes (Details Textual) (USD $)			3 Months Ended
Income Taxes (Details Textual) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Scenario, Forecast [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 1,439,000	$ 1,885,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	106,000	89,000
Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations Over 12 Months			538,000
Unrecognized Tax Benefits	$ 1,990,000	$ 1,357,000

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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