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Commitments and Contingencies (Schedule Of Future Minimum Rental Commitments under Non-cancelable Operating Leases) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]
2012	$ 9,551
2013	9,424
2014	9,529
2015	9,692
2016	10,188
Thereafter	641,230
Future minimum annual rental commitments under non-cancelable operating leases, due	$ 689,614

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

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within one year of the balance sheet date relating to leases defined as operating.

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