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MORTGAGE AND OTHER INDEBTEDNESS, NET - Narrative (Details) | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2019 USD ($) | Dec. 31, 2019 USD ($) mall associated_center subsidiary loan mortgage_note_receivable | Apr. 30, 2019 USD ($) | Jan. 31, 2019 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage and other indebtedness, variable-rate debt |  | $ 847,275,000 |  |  |  | $ 955,751,000 |
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 |  |  |  |  |
Ownership Interest in Guarantor Subsidiary by Operating Partnership, Percent |  | 100.00% |  |  |  |  |
Guarantor Subsidiaries |  |  |  |  |  |  |
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 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 | mortgage_note_receivable |  | 4 |  |  |  |  |
Unsecured lines of credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 1,100,000,000 |  |  |  |  |
Line of Credit | Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 1,185,000,000 |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 3.94% |  |  |  |  |
Quarterly Installment Payments on Debt |  | $ 35,000,000 |  |  |  |  |
Line of Credit | Secured Debt | Guarantor Subsidiaries |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 1,185,000,000 |  |  | 1,185,000,000 |  |
Line of Credit | Secured Debt | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  | 0.25% |  |  |  |  |
Line of Credit | Secured Debt | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  | 0.35% |  |  |  |  |
Unsecured Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 695,000,000 |  | $ 500,000,000 |  | $ 695,000,000 |
Debt Instrument, Number Of Instruments | loan |  | 3 |  |  |  |  |
Unsecured Term Loan | Unsecured lines of credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Number Of Instruments | loan |  | 3 |  |  |  |  |
Unsecured Term Loan | Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 500,000,000 |  |
Revolving Credit Facility | Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 685,000,000 |  |  |  |  |
Secured Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage and other indebtedness, variable-rate debt |  | 310,925,000 |  |  |  |  |
Secured Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage and other indebtedness, variable-rate debt |  | 465,000,000 |  |  |  |  |
Mortgages | Volusia Mall |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 41,000,000 | $ 50,000,000 |  |  |  |
Stated interest rate (as a percent) |  | 4.56% | 8.00% |  |  |  |
Mortgages | Laredo Outlet Shoppes L L C |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage | 35.00% |  |  |  |  |  |
Letters of Credit Outstanding, Amount | $ 10,800,000 |  |  |  |  |  |
Debt available balance | $ 43,000,000 |  |  |  |  |  |
Mortgages | Guarantor Subsidiaries |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 37,295,000
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  | 5.75%

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