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Financing Activity - Mortgage Loan Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 25, 2021
Feb. 08, 2021
Dec. 31, 2020
Sep. 30, 2021
Debt Instrument [Line Items]        
Mortgage loans payable, net     $ 884,503 $ 856,986
Mortgage Loan | Commercial Real Estate        
Debt Instrument [Line Items]        
Repayment of deferred amounts period start date     2020-08  
Repayment of deferred amounts period end date     2021-02  
Mortgage Loan | Commercial Real Estate | Minimum        
Debt Instrument [Line Items]        
Repayment of deferred amounts extended term     4 months  
Mortgage Loan | Commercial Real Estate | Maximum        
Debt Instrument [Line Items]        
Repayment of deferred amounts extended term     6 months  
Francis Scott Key Mall | Mortgage Loan | Commercial Real Estate        
Debt Instrument [Line Items]        
Mortgage loans payable, net $ 60,500      
Debt instrument, maturity date Jun. 25, 2024      
Lender fees as additional debt issuance costs $ 300      
Francis Scott Key Mall | Mortgage Loan | Commercial Real Estate | LIBOR        
Debt Instrument [Line Items]        
Debt, variable interest rate 3.60%      
Viewmont Mall | Mortgage Loan | Commercial Real Estate        
Debt Instrument [Line Items]        
Mortgage loans payable, net $ 67,200      
Debt instrument, maturity date Jun. 25, 2024      
Lender fees as additional debt issuance costs $ 500      
Viewmont Mall | Mortgage Loan | Commercial Real Estate | LIBOR        
Debt Instrument [Line Items]        
Debt, variable interest rate 3.60%      
Woodland Amendment | Mortgage Loan | Commercial Real Estate        
Debt Instrument [Line Items]        
Debt instrument, maturity date   Dec. 10, 2021    
Lender fees as additional debt issuance costs   $ 300    
Full recourse guarantee amount   10,000    
Required payment re margin to lenders   $ 5,000