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Co-Venture Arrangement: (Details) $ / shares in Units, ft² in Thousands, $ in Thousands		12 Months Ended
	Sep. 30, 2009 USD ($) ft² $ / shares shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Co-Venture Arrangement:
Cash proceeds for the overall transaction		$ 646,898	$ 320,123	$ 416,077
Co-venture obligation		63,756	75,450
Freehold Raceway Mall and Chandler Fashion Center
Co-Venture Arrangement:
Ownership interest (as a percent)	49.90%
Warrant in favor of the third party to purchase shares of common stock (in shares) | shares	935,358
Exercise price of stock warrants (in dollars per share) | $ / shares	$ 46.68
Cash proceeds for the overall transaction	$ 174,650
Proceeds attributed to warrants	6,496
Co-venture obligation	$ 168,154	$ 63,756	$ 75,450
Freehold Raceway Mall
Co-Venture Arrangement:
Property square footage | ft²	1,669
Chandler Fashion Center
Co-Venture Arrangement:
Property square footage | ft²	1,319

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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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- Definition

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

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-- None. No documentation exists for this element. --

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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 FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28183637&loc=d3e4724-112606

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Warrant
-URI http://asc.fasb.org/extlink&oid=6528364

Reference 5: 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

Area of a real estate property.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
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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.

+ References

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-Section S99
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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