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Mortgage and Other Indebtedness, Net - Narrative (Details) | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2019 USD ($) | Jun. 30, 2019 USD ($) associated_center mortgage_note_receivable mall subsidiary | Dec. 31, 2018 USD ($) unsecured_term_loan | Apr. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jan. 31, 2019 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
Ownership interest in guarantor subsidiaries by Operating Partnership (as a percent) |  | 100.00% |  |  |  |  |  |
Principal maturities for remainder of fiscal year |  | $ 139,396,000 |  |  |  |  |  |
Principal maturities for remainder of fiscal year Related to maturing operating property loans |  | $ 98,256,000 |  |  |  |  |  |
Weighted-average maturity period |  | 4 years 3 months 18 days | 3 years 8 months 12 days |  |  |  |  |
Unsecured lines of credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of debt instruments | unsecured_term_loan |  |  | 3 |  |  |  |  |
Maximum borrowing capacity |  |  | $ 1,100,000,000 |  |  |  |  |
Secured line of credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Variable-rate debt |  | $ 383,084,000 |  |  |  |  |  |
Unsecured term loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total Outstanding |  |  | $ 695,000,000 |  |  | $ 500,000,000 |  |
Number of debt instruments | unsecured_term_loan |  |  | 3 |  |  |  |  |
Non-recourse loans on operating properties |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total Outstanding |  | 163,476,000 |  |  |  |  |  |
Default minimum of debt instrument |  | 50,000,000 |  |  |  |  |  |
Secured term loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Variable-rate debt |  | $ 482,500,000 |  |  |  |  |  |
Secured Debt | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total Outstanding |  |  |  |  |  |  | $ 1,185,000,000 |
Interest rate (as a percent) |  | 4.69% |  |  |  |  |  |
Quarterly installment payments on debt |  |  |  |  |  |  | 35,000,000 |
Secured Debt | Line of Credit | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Annual facility fee (as a percent) |  | 0.25% |  |  |  |  |  |
Secured Debt | Line of Credit | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Annual facility fee (as a percent) |  | 0.35% |  |  |  |  |  |
Secured Debt | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total Outstanding |  |  |  |  |  |  | 685,000,000 |
Secured Debt | Unsecured term loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total Outstanding |  |  |  |  |  |  | 500,000,000 |
LIBOR | Unsecured Term Loan 1 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 2.25% |  |  |  |  |  |
Guarantor Subsidiaries |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
Principal maturities for remainder of fiscal year |  | $ 68,980,000 |  |  |  |  |  |
Weighted-average maturity period |  | 1 year 10 months 24 days | 1 year 1 month 6 days |  |  |  |  |
Guarantor Subsidiaries | Mortgages |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total Outstanding |  |  |  |  |  |  |  | $ 37,295,000
Interest rate (as a percent) |  |  |  |  |  |  |  | 5.75%
Guarantor Subsidiaries | Secured Debt | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total Outstanding |  |  |  |  |  |  | $ 1,185,000 |
Volusia Mall | Mortgages |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total Outstanding |  |  |  | $ 50,000,000 | $ 41,000,000 |  |  |
Stated interest rate (as a percent) |  |  |  | 4.56% | 8.00% |  |  |
Outlet Shoppes at Laredo | Mortgages |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total Outstanding | $ 43,000,000 |  |  |  |  |  |  |
Early repayment of debt | $ 10,800,000 |  |  |  |  |  |  |

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