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Co-Venture Arrangement: (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended			1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Sep. 30, 2009 Freehold Raceway Mall and Chandler Fashion Center
Co-Venture Arrangement:
Interest sold to third party (as a percent)				49.90%
Number of common shares available for purchase under warrant				935,358
Exercise price of stock warrants (in dollars per share)				$ 46.68
Cash proceeds for sale of interest in property	$ 315,059	$ 130,645		$ 174,650
Proceeds attributed to the warrants				6,496
Co-venture obligation	$ 86,677		$ 92,215	$ 168,154

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- Definition

The percentage of ownership interest in the joint venture sold by the entity during the period.

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Cash inflows from the sale of partnership interests, other assets, and discontinued operations.

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- Definition

Increase in additional paid in capital due to warrants issued during the period. Includes also the proceeds of debt securities issued with detachable stock purchase warrants that are allocable to the warrants. These warrants qualify for equity classification and provide the holder with a right to purchase stock from the entity.

+ References

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The exercise price of each class of warrants or rights outstanding.

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The specified number of securities that each class of warrants or rights outstanding give the holder the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date.

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Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date.

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