Income Taxes (Details) (USD $)	6 Months Ended
Jun. 30, 2011
Income Taxes
Gross unrecognized tax benefits	$ 555,000
Effective income tax rate on unrecognized tax benefits that would impact effective tax rate	0.40%
Recognized benefit in interest	6,000
Accrued interest related to unrecognized tax benefits	$ 177,000

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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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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