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Disposed Properties - Schedule of Disposal Groups (Details) $ in Thousands			3 Months Ended		9 Months Ended
	Jun. 26, 2018 USD ($)	Mar. 21, 2018 USD ($)	Sep. 30, 2019 USD ($) ft²	Sep. 30, 2018 USD ($) ft²	Sep. 30, 2019 USD ($) ft²	Sep. 30, 2018 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price					$ 190,200	$ 282,950
Gain (loss) on extinguishment of debt, net (d)			$ (2,092)	$ (4)	$ (2,901)	$ 10,693
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			1,151,500	2,232,000	1,151,500	2,232,000
Gross Disposition Price					$ 190,200	$ 282,950
Gain (loss) on sale and transfer of investment properties, net					32,443	51,741
Gain (loss) on extinguishment of debt, net (d)					$ (2,901)	$ 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			173,000		173,000
Gross Disposition Price					$ 26,300
Gain (loss) on sale and transfer of investment properties, net					5,531
Gain (loss) on extinguishment of debt, net (d)					$ (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			101,000		101,000
Gross Disposition Price					$ 6,650
Gain (loss) on sale and transfer of investment properties, net					131
Gain (loss) on extinguishment of debt, net (d)					$ 0
Promenade Fultondale | 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			207,600		207,600
Gross Disposition Price					$ 23,200
Gain (loss) on sale and transfer of investment properties, net					1,861
Gain (loss) on extinguishment of debt, net (d)					$ 0
Crossroads at Chesapeake Square and Chesapeake 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			198,700		198,700
Gross Disposition Price					$ 23,100
Gain (loss) on sale and transfer of investment properties, net					1,353
Gain (loss) on extinguishment of debt, net (d)					$ 0
West Creek | 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			53,300		53,300
Gross Disposition Price					$ 18,700
Gain (loss) on sale and transfer of investment properties, net					5,962
Gain (loss) on extinguishment of debt, net (d)					$ 0
Boynton 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			210,300		210,300
Gross Disposition Price					$ 50,000
Gain (loss) on sale and transfer of investment properties, net					18,405
Gain (loss) on extinguishment of debt, net (d)					$ 0
Quebec Square | 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			207,600		207,600
Gross Disposition Price					$ 42,250
Gain (loss) on sale and transfer of investment properties, net					(800)
Gain (loss) on extinguishment of debt, net (d)					$ (2,092)
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				485,000		485,000
Gross Disposition Price						$ 63,000
Gain (loss) on sale and transfer of investment properties, net						12,382
Gain (loss) on extinguishment of debt, net (d)						$ 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				239,000		239,000
Gross Disposition Price						$ 33,500
Gain (loss) on sale and transfer of investment properties, net						6,564
Gain (loss) on extinguishment of debt, net (d)						$ 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				283,000		283,000
Gross Disposition Price						$ 31,000
Gain (loss) on sale and transfer of investment properties, net						(666)
Gain (loss) on extinguishment of debt, net (d)						$ 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				265,000		265,000
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 (d)						$ 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 (d)						$ 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				45,000		45,000
Gross Disposition Price						$ 10,000
Gain (loss) on sale and transfer of investment properties, net						1,592
Gain (loss) on extinguishment of debt, net (d)						$ 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				156,000		156,000
Gross Disposition Price						$ 29,000
Gain (loss) on sale and transfer of investment properties, net						3,849
Gain (loss) on extinguishment of debt, net (d)						$ (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				67,000		67,000
Gross Disposition Price						$ 22,750
Gain (loss) on sale and transfer of investment properties, net						7,184
Gain (loss) on extinguishment of debt, net (d)						$ 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				76,000		76,000
Gross Disposition Price						$ 0
Gain (loss) on sale and transfer of investment properties, net	$ 22					(22)
Gain (loss) on extinguishment of debt, net (d)						$ 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				143,000		143,000
Gross Disposition Price						$ 23,700
Gain (loss) on sale and transfer of investment properties, net						5,357
Gain (loss) on extinguishment of debt, net (d)						$ (1,695)
Tulsa Hills | 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				473,000		473,000
Gross Disposition Price						$ 70,000
Gain (loss) on sale and transfer of investment properties, net						13,476
Gain (loss) on extinguishment of debt, net (d)						0
Additional Loan | Retail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on extinguishment of debt, net (d)						$ (4)

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