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Disposed Properties - Schedule of Disposal Groups (Details) ft² in Thousands, $ in Thousands		3 Months Ended
	Mar. 21, 2018 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price		$ 0	$ 127,500
Gain on Extinguishment of Debt		$ 0	$ 10,751
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			1,272
Gross Disposition Price			$ 127,500
Gain (Loss) on Sale and Transfer of Investment Properties, net			20,305
Gain on Extinguishment of Debt			$ 10,751
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
Gross Disposition Price			$ 63,000
Gain (Loss) on Sale and Transfer of Investment Properties, net			12,382
Gain on Extinguishment of Debt			$ 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
Gross Disposition Price			$ 33,500
Gain (Loss) on Sale and Transfer of Investment Properties, net			6,564
Gain on Extinguishment of Debt			$ 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
Gross Disposition Price			$ 31,000
Gain (Loss) on Sale and Transfer of Investment Properties, net			(666)
Gain on Extinguishment of Debt			$ 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
Gross Disposition Price			$ 0
Gain (Loss) on Sale and Transfer of Investment Properties, net	$ 1,777		1,777
Gain on Extinguishment of Debt			$ 10,751
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
Gross Disposition Price			$ 0
Gain (Loss) on Sale and Transfer of Investment Properties, net			248
Gain on Extinguishment of Debt			$ 0

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

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