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Income Taxes (Details) (USD $)	3 Months Ended
Income Taxes (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Income Taxes
State and foreign income taxes	$ 18,000	$ 18,000
Changes in unrecognized tax benefits	0
Unrecognized tax benefits	11,900,000
Interest and penalties associated with unrecognized income tax benefits	$ 0

This element represents the total of interest expense 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 in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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