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Income Taxes Accrued Interest and Penalties, Unrecognized Tax Benefits (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Income Tax Contingency [Line Items]
Accrued interest	$ 4,766	$ 4,403
Accrued penalties	3,574	3,233
Unrecognized tax benefits related to uncertain tax positions	29,162	42,175
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate	$ 29,089	$ 30,832

This element represents the amount of statutory penalties accrued as of the date of the statement of financial position 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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- Definition

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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