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Accounts Payable And Accrued Expenses (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Accounts Payable And Accrued Expenses [Abstract]
Net increase in accrued salaries and bonuses	$ 15,400,000
Accrued salaries and bonuses	147,613,000	132,221,000
Decrease in accrual for uncertain tax positions	7,700,000
Accrual for uncertain tax positions	$ 3,242,000	$ 10,948,000

This element represents the total of accruals as of the date of the statement of financial position for interest 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 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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