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Subsequent Events - (Details) $ in Thousands						9 Months Ended
	Nov. 06, 2018 USD ($) ft²	Nov. 05, 2018 USD ($)	Nov. 02, 2018 USD ($)	Oct. 23, 2018 USD ($) ft²	Oct. 05, 2018 USD ($) ft² Properties	Sep. 30, 2018 USD ($) ft²	Sep. 30, 2017 USD ($) ft²
Subsequent Event [Line Items]
Gross disposition price						$ 282,950	$ 206,130
Retail
Subsequent Event [Line Items]
Square Feet | ft²						2,232,000	1,250,000
Gross disposition price						$ 282,950	$ 152,630
Subsequent Event | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Subsequent Event [Line Items]
Square Feet | ft²	879,000
Gross disposition price	$ 123,100
Subsequent Event | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | McKinney Town Center
Subsequent Event [Line Items]
Square Feet | ft²					243,000
Gross disposition price					$ 51,000
Subsequent Event | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Riverstone Shopping Center
Subsequent Event [Line Items]
Square Feet | ft²					273,000
Gross disposition price					$ 27,750
Subsequent Event | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Victory Lakes Shopping Center
Subsequent Event [Line Items]
Square Feet | ft²					370,000
Gross disposition price					$ 53,000
Subsequent Event | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Hiram Pavilion
Subsequent Event [Line Items]
Square Feet | ft²				363,000
Gross disposition price				$ 44,350
Subsequent Event | Mortgages payable | Woodlake Crossing
Subsequent Event [Line Items]
Debt extinguished		$ 7,575
Subsequent Event | IAGM Retail Fund I, LLC | Mortgages payable
Subsequent Event [Line Items]
Debt extinguished					$ 38,300
Number of retail properties | Properties					2
Subsequent Event | IAGM Retail Fund I, LLC | Senior Secured Term Loan
Subsequent Event [Line Items]
Debt facility			$ 152,000
Extension fee			0.10%
Subsequent Event | IAGM Retail Fund I, LLC | Senior Secured Term Loan | One-month LIBOR
Subsequent Event [Line Items]
Basis spread on variable interest rate (percent)			1.55%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

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