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Income Taxes Additional Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Deferred Tax Liability Not Recognized [Line Items]
Uncertain tax positions	$ 22,770	$ 25,570
Uncertain tax positions that, if recognized, would impact effective tax rate	2,071	3,891
Accrued interest liability relating to uncertain tax positions	5,165	5,741
Interest expense included in accrued interest liability	$ 335	$ 368

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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- Definition

This element represents 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.

+ References+ Details