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QUARTERLY INFORMATION - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  |  | $ 71,722,000 |  | $ 30,927,000
Loss on impairment of real estate |  |  |  |  | 239,521,000 | $ 174,529,000 | 71,401,000
Accrued maximum expense related to settlement |  |  |  | $ 88,150,000 |  |  |
Loss on investment |  |  |  |  | 67,242,000 |  | (6,197,000)
Gain on Sale of Investments |  |  |  |  | $ 67,242,000 |  | $ 6,197,000
Outlet Shoppes at El Paso |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Loss on investment |  | $ 11,174,000 |  |  |  |  |
Acadiana Mall and Cary Towne Center |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  | 71,722,000 |  |  |
Greenbrier Mall and Honey Creek Mall |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Loss on impairment of real estate |  |  |  | $ 24,825,000 |  |  |
EastGate Mall and The Forum at Grandview |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Loss on impairment of real estate |  |  | $ 41,608,000 |  |  |  |
Laurel Park Place and Mid Rivers Mall |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Loss on impairment of real estate |  | $ 135,688,000 |  |  |  |  |
Park Plaza Mall |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Loss on impairment of real estate | $ 37,400,000 |  |  |  |  |  |
The Outlet Shoppes at Atlanta |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Gain on Sale of Investments | $ 56,067,000 |  |  |  |  |  |

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