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Combined Guarantor Subsidiaries - Dispositions - Summary of Disposition (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain on extinguishment of debt | $ 71,722,000 |  | $ 30,927,000
Loss on impairment | 239,521,000 | $ 174,529,000 | 71,401,000
Non-recourse loans on operating properties |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Balance of Non-recourse Debt |  | 43,716,000 |
Guarantor Subsidiaries |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain on extinguishment of debt | 61,796,000 | 0 | 28,815,000
Loss on impairment | 60,170,000 | $ 0 | 43,007,000
Guarantor Subsidiaries | Acadiana Mall |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Loss on impairment |  |  | $ 43,007,000
Guarantor Subsidiaries | Malls |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Loss on impairment | 60,170,000 |  |
Guarantor Subsidiaries | Non-recourse loans on operating properties | Malls | Acadiana Mall |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Balance of Non-recourse Debt | 119,760,000 |  |
Gain on extinguishment of debt | $ 61,796,000 |  |

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