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Dispositions (Details) ft² in Thousands, $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 17, 2018 USD ($) ft² | Mar. 01, 2018 USD ($) | Nov. 16, 2017 USD ($) ft² | Jan. 18, 2017 USD ($) ft² | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Discontinued Operations: |  |  |  |  |  |
Proceeds from sale |  | $ 142,500 |  |  |  |
Cascade Mall |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  | 589 |  |
Northgate Mall |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  | 750 |  |
Cascade and Northgate Malls |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |
Proceeds from sale |  |  |  | $ 170,000 |  |
Gain (loss) on disposal |  |  |  |  |  | $ 59,713
500 North Michigan Avenue |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |
Property area (in square feet) | ft² |  |  | 326 |  |  |
Proceeds from sale |  |  | $ 86,350 |  |  |
Gain (loss) on disposal |  |  | $ 14,597 |  |  |
Promenade at Casa Grande |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |
Property area (in square feet) | ft² | 761 |  |  |  |  |
Proceeds from sale | $ 26,000 |  |  |  |  |
Promenade at Casa Grande |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  | $ (311) |

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