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Combined Guarantor Subsidiaries - Organization and Basis of Presentation - Narrative (Details) | Mar. 31, 2019 associated_center mall subsidiary state mortgage_note_receivable senior_unsecured_note | 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 the credit facility | mall | 17 |
Number of associated centers securing the credit facility | associated_center | 3 |
Number of wholly owned subsidiaries | subsidiary | 36 |
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 the credit facility | mall | 17 |
Number of associated centers securing the credit facility | associated_center | 3 |
Number of wholly owned subsidiaries | subsidiary | 36 |
Number of malls not classified as collateral for the secured credit facility | mall | 5 |
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 for the secured credit facility | mortgage_note_receivable | 4 |
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
Line of Credit | Secured Debt | Guarantor Subsidiaries |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Balance of Non-recourse Debt | $ |  | $ 1,185,000
Senior Unsecured Notes | Guarantor Subsidiaries |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Number of debt instruments | senior_unsecured_note | 3 |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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