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Real Estate Properties (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Real Estate Properties
Real estate properties, at cost	$ 4,721,591	$ 3,761,712
Accumulated depreciation	630,261	538,872
Future minimum lease payments
2012	395,571
2013	386,123
2014	344,834
2015	330,356
2016	313,619
Thereafter	2,628,386
Land
Real Estate Properties
Real estate properties, at cost	564,628	446,622
Buildings and improvements.
Real Estate Properties
Real estate properties, at cost	3,969,086	3,153,466
Accumulated depreciation	543,064	465,216
Furniture, fixtures and equipment
Real Estate Properties
Real estate properties, at cost	187,877	161,624
Accumulated depreciation	$ 87,197	$ 73,656

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

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Future rental payments receivable within the fourth year from the balance sheet date under an operating lease.

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The cumulative amount of depreciation for real estate property held for investment purposes.

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Represents a total which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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