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Disposed Properties - Schedule of Disposal Groups (Details) $ in Thousands				3 Months Ended		9 Months Ended
	Jun. 26, 2018 USD ($)	Mar. 21, 2018 USD ($)	Apr. 17, 2017 USD ($)	Sep. 30, 2018 USD ($) ft²	Sep. 30, 2017 USD ($) ft²	Sep. 30, 2018 USD ($) ft²	Sep. 30, 2017 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price						$ 282,950	$ 206,130
Gain (Loss) on Extinguishment of Debt (d)				$ 4	$ 42	$ (10,693)	$ (840)
Retail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				2,232,000	1,250,000	2,232,000	1,250,000
Gross Disposition Price						$ 282,950	$ 152,630
Gain (Loss) on Sale of Investment Properties, net						51,741	21,634
Gain (Loss) on Extinguishment of Debt (d)						(10,697)	$ (840)
Retail | Additional Loan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Extinguishment of Debt (d)						$ 4
Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Sherman Town Center I & II
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				485,000		485,000
Gross Disposition Price						$ 63,000
Gain (Loss) on Sale of Investment Properties, net						12,382
Gain (Loss) on Extinguishment of Debt (d)						$ 0
Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Grafton Commons
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				239,000		239,000
Gross Disposition Price						$ 33,500
Gain (Loss) on Sale of Investment Properties, net						6,564
Gain (Loss) on Extinguishment of Debt (d)						$ 0
Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Lakeport Commons
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				283,000		283,000
Gross Disposition Price						$ 31,000
Gain (Loss) on Sale of Investment Properties, net						(666)
Gain (Loss) on Extinguishment of Debt (d)						$ 0
Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Market at Morse/Hamilton
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				45,000		45,000
Gross Disposition Price						$ 10,000
Gain (Loss) on Sale of Investment Properties, net						1,592
Gain (Loss) on Extinguishment of Debt (d)						$ 0
Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Siegen Plaza
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				156,000		156,000
Gross Disposition Price						$ 29,000
Gain (Loss) on Sale of Investment Properties, net						3,849
Gain (Loss) on Extinguishment of Debt (d)						$ 54
Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Tomball Town Center
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				67,000		67,000
Gross Disposition Price						$ 22,750
Gain (Loss) on Sale of Investment Properties, net						7,184
Gain (Loss) on Extinguishment of Debt (d)						$ 0
Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Parkway Centre North
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				143,000		143,000
Gross Disposition Price						$ 23,700
Gain (Loss) on Sale of Investment Properties, net						5,357
Gain (Loss) on Extinguishment of Debt (d)						$ 1,695
Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Penn Park
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²					242,000		242,000
Gross Disposition Price							$ 29,050
Gain (Loss) on Sale of Investment Properties, net							1,021
Gain (Loss) on Extinguishment of Debt (d)							$ 0
Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Sparks Crossing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²					336,000		336,000
Gross Disposition Price							$ 40,280
Gain (Loss) on Sale of Investment Properties, net							10,584
Gain (Loss) on Extinguishment of Debt (d)							$ 0
Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Lincoln Village
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²					164,000		164,000
Gross Disposition Price							$ 30,000
Gain (Loss) on Sale of Investment Properties, net							2,355
Gain (Loss) on Extinguishment of Debt (d)							$ 0
Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Tulsa Hills
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				473,000		473,000
Gross Disposition Price						$ 70,000
Gain (Loss) on Sale of Investment Properties, net						13,476
Gain (Loss) on Extinguishment of Debt (d)						$ 0
Retail | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Transfer | Stonecrest Marketplace
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				265,000		265,000
Gross Disposition Price						$ 0
Gain (Loss) on Sale of Investment Properties, net						1,777
Gain (Loss) on Extinguishment of Debt (d)						$ (10,752)
Carrying value, surrendered properties		$ 23,932
Retail | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Transfer | Bellerive Plaza
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				76,000		76,000
Gross Disposition Price						$ 0
Gain (Loss) on Sale of Investment Properties, net				$ (22)		(22)
Gain (Loss) on Extinguishment of Debt (d)						$ (1,694)
Carrying value, surrendered properties	$ 4,771
Retail | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Transfer | Intech Retail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²					19,000		19,000
Gross Disposition Price							$ 0
Gain (Loss) on Sale of Investment Properties, net					$ (53)		(53)
Gain (Loss) on Extinguishment of Debt (d)							$ (882)
Carrying value, surrendered properties			$ 2,338
Retail | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Condemnation | Northwest Marketplace
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				0		0
Gross Disposition Price						$ 0
Gain (Loss) on Sale of Investment Properties, net						248
Gain (Loss) on Extinguishment of Debt (d)						$ 0
Retail | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Condemnation | Market at Westlake
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²					0		0
Gross Disposition Price							$ 0
Gain (Loss) on Sale of Investment Properties, net							474
Gain (Loss) on Extinguishment of Debt (d)							$ 0
Retail | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Condemnation | Pavilions at Hartman Heritage
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²					223,000		223,000
Gross Disposition Price							$ 21,700
Gain (Loss) on Sale of Investment Properties, net							(1,708)
Gain (Loss) on Extinguishment of Debt (d)							$ 0
Retail | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Condemnation | Legacy Crossing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²					134,000		134,000
Gross Disposition Price							$ 10,250
Gain (Loss) on Sale of Investment Properties, net							(211)
Gain (Loss) on Extinguishment of Debt (d)							$ 1
Retail | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Condemnation | Heritage Plaza
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²					132,000		132,000
Gross Disposition Price							$ 21,350
Gain (Loss) on Sale of Investment Properties, net							9,172
Gain (Loss) on Extinguishment of Debt (d)							$ 41

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