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Co-Venture Arrangement: (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended			0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2009 Freehold Raceway Mall and Chandler Fashion Center	Sep. 30, 2009 Freehold Raceway Mall and Chandler Fashion Center
Co-Venture Arrangement:
Percentage of oan assumed by third party (as a percent)					49.90%
Number of common shares available for purchase under warrant (in shares)				935,358
Exercise price of stock warrants (in dollars per share)				46.68
Cash proceeds for sale of interest in property	$ 327,059	$ 130,691		$ 174,650
Proceeds attributed to the warrants				6,496
Co-venture obligation	$ 83,951		$ 92,215	$ 168,154

X

- Definition

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

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- Definition

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

+ References

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- Definition

Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5



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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

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-Topic 235

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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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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