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Dispositions (Details) ft² in Thousands, $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) | May 17, 2018 USD ($) ft² | Nov. 16, 2017 USD ($) ft² | Jan. 18, 2017 USD ($) ft² | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale | $ 142,500 |  |  |  |  |  |
(Loss) gain on sale or write down of assets, net |  |  |  |  | $ (11,909) | $ (31,825) | $ 42,446
Cascade Mall |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  | 589 |  |  |
Northgate Mall |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  | 750 |  |  |
Cascade and Northgate Malls |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale |  |  |  | $ 170,000 |  |  |
Gain (loss) on disposal |  |  |  |  |  |  | $ 59,577
500 North Michigan Avenue |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  | 326 |  |  |  |
Proceeds from sale |  |  | $ 86,350 |  |  |  |
Gain (loss) on disposal |  |  | $ 14,597 |  |  |  |
Promenade at Casa Grande |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Property area (in square feet) | ft² |  | 761 |  |  |  |  |
Proceeds from sale |  | $ 26,000 |  |  |  |  |
(Loss) gain on sale or write down of assets, net |  | $ (311) |  |  |  |  |

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