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Combined Guarantor Subsidiaries - Organization - Narrative (Details) | Jun. 30, 2020 USD ($) state mall associated_center subsidiary mortgage_note_receivable senior_unsecured_note | Dec. 31, 2019 USD ($) | Jan. 01, 2019 USD ($)
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Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Number of states in which entity operates | state | 26 |  |
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 |  |
Mortgage and other indebtedness, variable-rate debt | $ 1,192,140,000 | $ 847,275,000 |
Line of Credit | Secured Debt |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Balance of non-recourse debt | 1,185,000,000 |  |
Secured Line of Credit |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Mortgage and other indebtedness, variable-rate debt | 675,925,000 | $ 310,925,000 |
Unsecured Debt [Member] |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Mortgage and other indebtedness, variable-rate debt | 447,500,000 |  |
Senior unsecured notes due 2023 |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Balance of non-recourse debt | 450,000,000 |  |
Senior unsecured notes due 2024 |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Balance of non-recourse debt | 300,000,000 |  |
Senior unsecured notes due 2026 |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Balance of non-recourse debt | $ 625,000,000 |  |
Guarantor Subsidiaries |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Number of states in which entity operates | state | 26 |  |
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 |  |
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 |  |
Guarantor Subsidiaries | Line of Credit | Secured Debt |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Balance of non-recourse debt | $ 1,185,000,000 |  | $ 1,185,000,000
Guarantor Subsidiaries | Senior Unsecured Notes |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Balance of non-recourse debt | $ 1,375,000,000 |  |
Debt instrument, number of instruments | senior_unsecured_note | 3 |  |
Guarantor Subsidiaries | Secured Line of Credit |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Mortgage and other indebtedness, variable-rate debt | $ 675,925,000 |  |
Guarantor Subsidiaries | Unsecured Debt [Member] |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Mortgage and other indebtedness, variable-rate debt | 447,500,000 |  |
Guarantor Subsidiaries | Senior unsecured notes due 2023 |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Balance of non-recourse debt | 450,000,000 |  |
Guarantor Subsidiaries | Senior unsecured notes due 2024 |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Balance of non-recourse debt | 300,000,000 |  |
Guarantor Subsidiaries | Senior unsecured notes due 2026 |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Balance of non-recourse debt | $ 625,000,000 |  |

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