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Property: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Jan. 15, 2014 Rotterdam Square sqft	Feb. 14, 2014 Somersville Town Center sqft	Mar. 17, 2014 Lake Square Mall sqft
Property, Plant and Equipment [Line Items]
Land	$ 1,697,973		$ 1,707,005
Buildings and improvements	6,499,863		6,555,212
Tenant improvements	533,650		537,754
Equipment and furnishings	153,177		152,198
Construction in progress	253,113		229,169
Total	9,137,776		9,181,338
Less accumulated depreciation	(1,583,797)		(1,559,572)
Property, net	7,553,979		7,621,766
Depreciation expenses	68,478	65,896
Gain on remeasurement, sale or write down of assets, net	(1,611)	4,828
Property area (in square feet)				585,000	348,000	559,000
Gain on the sale of assets		5,419
Write off of development cost		$ (591)

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Gains or losses resulting from either the difference between the carrying value and the sales price or remeasurement of the carrying value for consolidated investment property and equity method investments.

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Represents the development cost written off during the period.

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Area of a real estate property.

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The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives.

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The current amount of expenditures for a real estate project that has not yet been completed.

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Amount before accumulated depreciation of fixtures and equipment. Includes, but is not limited to, machinery, equipment, and engines.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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

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Amount of real estate investment property 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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Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants.

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