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Mortgage and Other Indebtedness, Net - Summary of 2020 Dispositions (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |  |
Gain on Extinguishment of Debt | $ 15,407 | $ 15,407 | $ 71,722
Hickory Point Mall | Forsyth, IL |  |  |
Debt Instrument [Line Items] |  |  |
Balance of Non-recourse Debt | $ 27,446 | 27,446 |
Gain on Extinguishment of Debt |  | $ 15,407 |

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