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Commitments And Contingencies (Summary Of Rental Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Commitments And Contingencies [Abstract]
Minimum rentals	$ 8,914	$ 9,088	$ 9,724
Less: Sublease rentals	(868)	(938)	(859)
Rental expense	$ 8,046	$ 8,150	$ 8,865

This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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