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Mortgage and Other Indebtedness, Net - Narrative (Details) | 9 Months Ended |
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Sep. 30, 2021 USD ($) mall associated_center subsidiary mortgage_note_receivable loan | Mar. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |
Number of Malls Securing Credit Facility, Collateral | mall | 17 |
Number of Associated Centers Securing Credit Facility, Collateral | associated_center | 3 |
Number of wholly owned subsidiaries | subsidiary | 36 |
Line of credit facility payment restrictions | 150,000 |
Number of non-recourse loans | loan | 2 |
Loans in default, aggregate outstanding balance | $ 727,603,000 |
Deconsolidation of secured loans amount | $ 138,926,000 |
Guarantor Subsidiaries |  |
Debt Instrument [Line Items] |  |
Number of malls not classified as collateral for the secured credit facility | mall | 4 |
Number of associated centers not classified as collateral for the secured credit facility | associated_center | 2 |
Number of Mortgage Notes Receivable not Classified as Collateral | mortgage_note_receivable | 4 |
COVID-19 |  |
Debt Instrument [Line Items] |  |
Secured credit facility, impact of uncertainty |  | $ 280,000,000
Line of Credit | Secured Debt |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ 1,185,000,000 |
Revolving Credit Facility | Secured Debt |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | 675,926,000 |
Secured Term Loan | Secured Debt |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | 438,750,000 |
Non-Recourse Loans on Operating Properties |  |
Debt Instrument [Line Items] |  |
Debt default threshold, minimum loan amount (greater than) | $ 50,000 |

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