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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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