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Future Rental Revenues: (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Future Rental Revenues:
2012	$ 423,290
2013	371,049
2014	328,355
2015	289,347
2016	251,328
Thereafter	813,711
Total	$ 2,477,080

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Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

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Future rental payments receivable within one year of the balance sheet date under an operating lease.

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