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DISPOSITIONS AND HELD FOR SALE - Summary (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Apr. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jan. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) outparcel | Dec. 31, 2019 USD ($) outparcel joint_venture | Dec. 31, 2018 USD ($) outparcel
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain on sales of real estate assets |  |  |  |  |  |  | $ 4,696 | $ 16,274 | $ 19,001
Gross Sales Price |  |  |  |  |  |  |  | 120,308 |
Net Sales Price |  |  |  |  |  |  |  | 118,383 |
Gain |  |  |  |  | $ 7,471 |  |  | 8,246 |
Loss on impairment |  |  |  |  |  |  | 213,358 | $ 239,521 | 174,529
Number of joint venture | joint_venture |  |  |  |  |  |  |  | 3 |
Gain (loss) on sale of outparcels |  |  |  |  |  |  |  | $ 33 |
Net Sales Price |  |  |  |  | 53,402 |  |  |  |
Gross Sales Price |  |  |  |  | 65,000 |  |  |  |
Acadiana Mall |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  | 1,593
Net Sales Price |  |  |  | $ 4,000 |  |  |  |  |
Honey Creek Mall |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Loss on impairment |  | $ (239) | $ 2,284 |  |  |  |  |  |
The Forum at Grandview |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Loss on impairment | $ 8,582 |  |  |  |  |  |  |  |
Janesville Mall |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  | $ 18,061 |  |  |
Statesboro Crossing |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Percentage of net proceeds from sale |  |  |  |  |  | 100.00% |  |  |
Statesboro Crossing | Corporate Joint Venture |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  | 50.00% |  |  |
Statesboro Crossing | Consolidated Properties |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  | 50.00% |  |  |
Malls |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  | 213,358 |  |
Malls | Cary Towne Center |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  | 31,500 |
Net Sales Price |  |  |  |  |  |  |  | 31,068 |
Malls | Honey Creek Mall |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  | 14,600 |
Net Sales Price |  |  |  |  |  |  |  | 14,360 |
Malls | Shopsat Hickory Point |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  | 2,508 |
Net Sales Price |  |  |  |  |  |  |  | 2,407 |
Gain |  |  |  |  |  |  |  | 1,326 |
Malls | Janesville Mall |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Net Sales Price |  |  |  |  | 17,783 |  |  |  |
Gross Sales Price |  |  |  |  | 18,000 |  |  |  |
Malls | College Square Mall |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain |  |  |  |  | 742 |  |  |  |
All Other | Courtyardby Marriottat Pearland Town Center |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  | 15,100 |
Net Sales Price |  |  |  |  |  |  |  | 14,795 |
Gain |  |  |  |  |  |  |  | 1,910 |
All Other | A850 Greenbriar Circle |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  | 10,500 |
Net Sales Price |  |  |  |  |  |  |  | 10,332 |
Gain |  |  |  |  |  |  |  | 96 |
All Other | Krogerat Foothill Plaza |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  | 2,350 |
Net Sales Price |  |  |  |  |  |  |  | 2,267 |
Gain |  |  |  |  |  |  |  | 1,139 |
All Other | The Forum at Grandview |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  | 31,750 |
Net Sales Price |  |  |  |  |  |  |  | 31,606 |
Gain |  |  |  |  |  |  |  | 47 |
All Other | Barnes Nobleat High Point |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  | 2,000 |
Net Sales Price |  |  |  |  |  |  |  | 1,899 |
Gain |  |  |  |  |  |  |  | 821 |
All Other | Dicks Sporting Goodsat Hanes Mall |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  | 10,000 |
Net Sales Price |  |  |  |  |  |  |  | 9,649 |
Gain |  |  |  |  |  |  |  | 2,907 |
All Other | Gulf Coast Town Center Phase I I I |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain |  |  |  |  | 2,236 |  |  |  |
Net Sales Price |  |  |  |  | 8,769 |  |  |  |
Gross Sales Price |  |  |  |  | 9,000 |  |  |  |
All Other | Statesboro Crossing |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain |  |  |  |  | 3,215 |  |  |  |
Net Sales Price |  |  |  |  | 10,532 |  |  |  |
Gross Sales Price |  |  |  |  | 21,500 |  |  |  |
All Other | Parkway Plaza |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain |  |  |  |  | 1,419 |  |  |  |
Net Sales Price |  |  |  |  | 16,318 |  |  |  |
Gross Sales Price |  |  |  |  | 16,500 |  |  |  |
All Other | Prior Sales Adjustment |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain |  |  |  |  | $ (141) |  |  |  |
Outparcel Sale |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain on sales of real estate assets |  |  |  |  |  |  | $ 4,696 | $ 6,434 | $ 11,530
Number of stores sold (outparcel) | outparcel |  |  |  |  |  |  | 8 | 5 | 12
Parkdale Self Storage L L C |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) related to land contributed |  |  |  |  |  |  |  | $ 1,627 |

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