Mortgage and Other Indebtedness, Net- Scheduled Principal Payments (Details) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
2021	$ 330,456
2022	408,399
2023	1,511,219
2024	343,397
2025	37,612
Thereafter	763,796
Total	3,394,879
Mortgage and other indebtedness, net	1,036,970	$ 1,184,831
Liabilities subject to compromise	$ 2,489,676	$ 2,489,676
Weighted-average remaining term to maturity	2 years 9 months 18 days	3 years
Greenbrier Mall
Debt Instrument [Line Items]
Mortgage and other indebtedness, net	$ 61,647
Debt instrument, maturity date	Dec. 31, 2019
Parkdale Mall & Crossing
Debt Instrument [Line Items]
Mortgage and other indebtedness, net	$ 73,313
Debt instrument, maturity date	Mar. 31, 2021
Hamilton Crossing
Debt Instrument [Line Items]
Debt instrument, maturity date	Apr. 30, 2021
Mortgages
Debt Instrument [Line Items]
Mortgage and other indebtedness, net	$ 3,529,839
Operating Property Loan
Debt Instrument [Line Items]
2021	$ 289,657
Number of operating property loans (loan) \| loan	6
Operating Property Loan \| Mortgages
Debt Instrument [Line Items]
Mortgage and other indebtedness, net	$ 134,960

Debt instrument weighted average remaining term to maturity.

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Long term debt maturities repayments of principal after year four.

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Number of Operating Property Loans

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of increase (decrease) in liabilities subject to compromise.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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