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Property, net - Schedule of Loss (Gain) on Sale or Write down of Assets (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2018 | Nov. 16, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 01, 2018
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Write-down of assets |  |  | $ (16,285) | $ (82,745) | $ (23,154) |
(Loss) gain on sale or write down of assets, net |  |  | (11,909) | (31,825) | 42,446 |
Outside partner interest of the operating partnership |  |  |  |  |  | 75.00%
Impairment losses |  |  | (16,285) | (82,745) | (23,154) |
Promenade at Casa Grande |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Write-down of assets |  |  |  | (1,043) | (10,072) |
Gain on disposal |  |  |  | (311) |  |
Impairment losses |  |  |  | (1,043) | (10,072) |
South Park Mall |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Write-down of assets |  |  |  | (36,338) |  |
Impairment losses |  |  |  | (36,338) |  |
La Cumbre Plaza |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Write-down of assets |  |  |  | (7,907) |  |
Impairment losses |  |  |  | (7,907) |  |
Two freestanding stores |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Write-down of assets |  |  |  | (7,494) |  |
Impairment losses |  |  |  | (7,494) |  |
Southridge Center |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Write-down of assets |  |  |  | (1,697) | (12,036) |
Impairment losses |  |  |  | (1,697) | (12,036) |
Westside Pavilion | Joint venture |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Gain on sale of assets | $ 46,242 |  |  | $ 46,242 |  |
Outside partner interest of the operating partnership | 75.00% |  |  | 75.00% |  |
Cascade and Northgate Malls |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Gain on disposal |  |  |  |  | 59,577 |
500 North Michigan Avenue |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Gain on disposal |  | $ 14,597 |  |  |  |
Property |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Gain on sale of assets |  |  | 0 | $ 45,931 | 74,174 |
Land |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Gain on sale of assets |  |  | 4,376 | 4,989 | 1,564 |
Non-real estate |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
(Loss) gain on sale or write down of assets, net |  |  | $ 0 | $ 0 | $ (10,138) |

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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=118932676&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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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 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=118932676&loc=d3e3602-108585 Reference 3: 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 + Details
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