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Commitments And Contingencies (Schedule Of Minimum Rental Commitments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Commitments And Contingencies [Abstract]
Minimum rental commitments, 2012	$ 36,871
Minimum rental commitments, 2013	37,336
Minimum rental commitments, 2014	35,427
Minimum rental commitments, 2015	32,513
Minimum rental commitments, 2016	27,963
Minimum rental commitments, Thereafter	70,695
Minimum rental commitments, Total	$ 240,805

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The total of future contractually required payments on leases defined as operating.

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