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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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