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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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