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MORTGAGE AND OTHER INDEBTEDNESS, NET - Narrative (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2019 USD ($) | Dec. 31, 2020 USD ($) mall associated_center subsidiary loan mortgage_note_receivable | Mar. 31, 2021 USD ($) | Aug. 06, 2020 | Dec. 31, 2019 USD ($) | Apr. 30, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 5.00% |  |
Mortgage and other indebtedness, variable-rate debt |  | $ 68,061 |  |  | $ 847,275 |
Secured credit facility, impact of uncertainty |  |  | $ 107,833 |  |  |
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 loans in default | loan |  | 14 |  |  |  |
Loans in default, aggregate outstanding balance |  | $ 833,444 |  |  |  |
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 |  |  |  |
Post-Default Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 9.50% |  |  |  |
Senior Unsecured Notes Due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest payment |  | $ 6,900 |  |  |  |
Debt Instrument, Face Amount |  | $ 300,000 |  |  |  |
Line of Credit | Base Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 4.50% |  |  |  |
Line of Credit | Prime Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 1.25% |  |  |  |
Line of Credit | Secured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 1,185,000 |  |  |  |
Debt instrument, maturity date |  | Jul. 31, 2023 |  |  |  |
Payment for loan |  | $ 4,812 |  |  |  |
Quarterly Installment Payments on Debt |  | $ 35,000 |  |  |  |
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% |  |  |  |
Line of Credit | Secured Debt | LIBOR Market Index Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 2.25% |  |  |  |
Line of Credit | Secured Debt | LIBOR Market Index Rate | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 1.00% |  |  |  |
Line of Credit | Secured Debt | LIBOR Market Index Rate | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 1.25% |  |  |  |
Line of Credit | Secured Debt | Federal Funds Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 0.50% |  |  |  |
Unsecured Term Loan | Secured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 438,750 |  |  |  |
Revolving Credit Facility | Secured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | 675,926 |  |  |  |
Secured Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage and other indebtedness, variable-rate debt |  | 675,926 |  |  | 310,925 |
Non-Recourse Loans on Operating Properties |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt default threshold, minimum loan amount (greater than) |  | $ 50,000 |  |  |  |
Fixed Rate Operating Loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted-average remaining term to maturity |  | 1 year 7 months 6 days |  |  |  |
Fixed Rate Operating Loans | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate of debt bearing fixed interest (as a percent) |  | 4.36% |  |  |  |
Fixed Rate Operating Loans | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate of debt bearing fixed interest (as a percent) |  | 5.99% |  |  |  |
Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loans in default, aggregate outstanding balance |  | $ 91,679 |  |  | 163,476 |
Mortgages | Volusia Mall |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 41,000 | $ 50,000
Interest rate percentage |  |  |  |  | 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 |  |  |  |  |
Debt available balance | $ 43,000 |  |  |  |  |

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