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Disposed Properties - Schedule of Disposal Groups (Details) ft² in Thousands, $ in Thousands			3 Months Ended		6 Months Ended
	Jun. 26, 2018 USD ($)	Mar. 21, 2018 USD ($)	Jun. 30, 2019 USD ($) ft²	Jun. 30, 2018 USD ($) ft²	Jun. 30, 2019 USD ($) ft²	Jun. 30, 2018 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price					$ 32,950	$ 212,950
Gain (Loss) on Extinguishment of Debt, net			$ (809)	$ (55)	$ (809)	$ 10,697
Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²			274	1,759	274	1,759
Gross Disposition Price					$ 32,950	$ 212,950
Gain (Loss) on Sale and Transfer of Investment Properties, net					5,662	38,265
Gain (Loss) on Extinguishment of Debt, net					$ (809)	$ 10,697
Brooks Corner | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²			173		173
Gross Disposition Price					$ 26,300
Gain (Loss) on Sale and Transfer of Investment Properties, net					5,531
Gain (Loss) on Extinguishment of Debt, net					$ (809)
Silverlake | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²			101		101
Gross Disposition Price					$ 6,650
Gain (Loss) on Sale and Transfer of Investment Properties, net					131
Gain (Loss) on Extinguishment of Debt, net					$ 0
Sherman Town Center I & II | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				485		485
Gross Disposition Price						$ 63,000
Gain (Loss) on Sale and Transfer of Investment Properties, net						12,382
Gain (Loss) on Extinguishment of Debt, net						$ 0
Grafton Commons | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				239		239
Gross Disposition Price						$ 33,500
Gain (Loss) on Sale and Transfer of Investment Properties, net						6,564
Gain (Loss) on Extinguishment of Debt, net						$ 0
Lakeport Commons | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				283		283
Gross Disposition Price						$ 31,000
Gain (Loss) on Sale and Transfer of Investment Properties, net						(666)
Gain (Loss) on Extinguishment of Debt, net						$ 0
Stonecrest Marketplace | Retail | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Transfer
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				265		265
Gross Disposition Price						$ 0
Gain (Loss) on Sale and Transfer of Investment Properties, net		$ 1,777				1,777
Gain (Loss) on Extinguishment of Debt, net						$ 10,752
Carrying value, surrendered properties		$ 23,932
Northwest Marketplace | Retail | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Condemnation
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 and Transfer of Investment Properties, net						248
Gain (Loss) on Extinguishment of Debt, net						$ 0
Market at Morse/Hamilton | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				45		45
Gross Disposition Price						$ 10,000
Gain (Loss) on Sale and Transfer of Investment Properties, net						1,592
Gain (Loss) on Extinguishment of Debt, net						$ 0
Siegen Plaza | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				156		156
Gross Disposition Price						$ 29,000
Gain (Loss) on Sale and Transfer of Investment Properties, net						3,849
Gain (Loss) on Extinguishment of Debt, net						$ (54)
Tomball Town Center | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				67		67
Gross Disposition Price						$ 22,750
Gain (Loss) on Sale and Transfer of Investment Properties, net						7,184
Gain (Loss) on Extinguishment of Debt, net						$ 0
Bellerive Plaza | Retail | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Transfer
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				76		76
Gross Disposition Price						$ 0
Gain (Loss) on Sale and Transfer of Investment Properties, net	$ 22					(22)
Gain (Loss) on Extinguishment of Debt, net						$ 1,694
Carrying value, surrendered properties	$ 4,771
Parkway Centre North | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet | ft²				143		143
Gross Disposition Price						$ 23,700
Gain (Loss) on Sale and Transfer of Investment Properties, net						5,357
Gain (Loss) on Extinguishment of Debt, net						$ (1,695)

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