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Income Taxes (Details Textual) (USD $)	12 Months Ended
Income Taxes (Details Textual) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes (Textual) [Abstract]
Capital Loss Carry Forward	$ 42,000,000
Capital loss carry forward, expiration year	2013
Gross Tax Effected Unrecognized Tax Benefits Including Interest and Penalties	59,532,000	50,216,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	18,966,000	18,189,000
Interest and penalties paid by the company	759,000	272,000	363,000
Accrued interest and penalties	$ 12,687,000	$ 10,791,000

This element represents the total of accruals as of the date of the statement of financial position for interest recognized 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 and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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