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Mortgage Notes Payable - Footnotes (Details) - USD ($)		6 Months Ended
	Dec. 04, 2017	Jun. 30, 2018	Mar. 01, 2018	Dec. 31, 2017
Mortgage loans payable on real estate
Unamortized deferred finance costs		$ 15,638,000		$ 17,838,000
Fashion Outlets of Niagara Falls USA
Mortgage loans payable on real estate
Debt premiums		$ 2,166,000		$ 2,630,000
Chandler Freehold
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				3.02%
Green Acres Commons
Mortgage loans payable on real estate
Interest rate spread over basis		2.15%
Santa Monica Place
Mortgage loans payable on real estate
Interest rate spread over basis	1.35%
Effective interest rate		3.67%		3.13%
Fashion Outlets of Chicago
Mortgage loans payable on real estate
Effective interest rate		3.64%
Green Acres Commons
Mortgage loans payable on real estate
Effective interest rate		4.69%		4.07%
Mortgage Loans on Real Estate, Face Amount of Mortgages, Additional Borrowing			$ 20,000,000

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Portion of the loan assumed by a third party.

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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
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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Amount, after accumulated amortization, of debt premium.

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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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