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Dispositions (Details) ft² in Thousands, $ in Thousands |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) | May 17, 2018 USD ($) ft² | Nov. 16, 2017 USD ($) ft² | Jan. 18, 2017 USD ($) ft² | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Discontinued Operations: |  |  |  |  |  |  |  |
Proceeds from sale | $ 142,500 |  |  |  |  |  |  |
Loss on sale of assets |  |  |  |  | $ 46,516 | $ (11,854) | $ (514) | $ 37,234
Promenade at Casa Grande |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |
Loss on sale of assets |  |  |  |  |  |  | $ (311) |
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 |  |  |  |  |  |  |  | $ 59,698
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 |  |  |  |  |  |

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- Definition Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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