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Mortgage Notes Payable - Footnotes (Details) - USD ($)		9 Months Ended
	Oct. 13, 2017	Sep. 30, 2017	Oct. 19, 2017	Sep. 29, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Unamortized deferred finance costs		$ 12,810,000			$ 12,716,000
Freehold Raceway Mall and Chandler Fashion Center
Mortgage loans payable on real estate
Percentage of loan assumed by third party		49.90%
Fashion Outlets of Chicago
Mortgage loans payable on real estate
Interest rate spread over basis		1.50%
Effective interest rate					2.43%
Freehold Raceway | Subsequent event | Joint Venture
Mortgage loans payable on real estate
New loan on property			$ 400,000,000
Interest rate on debt			3.90%
Green Acres Commons
Mortgage loans payable on real estate
Interest rate spread over basis		2.15%
New loan on property				$ 110,000,000
Loan expansion, up to				$ 130,000,000
Santa Monica Place | Subsequent event
Mortgage loans payable on real estate
New loan on property	$ 300,000,000
Debt term	5 years

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
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Amount of the contractual principal due at the origination of the mortgage loan (face amount).

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