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Income Taxes (Details) (USD $)	3 Months Ended
Income Taxes (Details) (USD $)	Mar. 31, 2012	Mar. 31, 2011
Income Taxes [Abstract]
Unrecognized tax benefits	$ 10,600,000
Interest included in unrecognized tax benefits	3,700,000
Expected decrease in unrecognized tax benefits related to uncertain tax positions over next 12 months	300,000
State income taxes	4,325,000
Provision for income taxes for foreign taxes	$ 4,977,000	$ 2,702,000

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of foreign enacted tax law to the foreign taxable Income or Loss from continuing operations.

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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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