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MORTGAGE AND OTHER INDEBTEDNESS, NET - Fixed Rate Debt (Details) - USD ($)
1 Months Ended 2 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Sep. 30, 2019
Aug. 31, 2019
Apr. 30, 2019
Sep. 30, 2018
Jan. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2017
Debt Instrument [Line Items]                      
Amount Financed or Extended               $ 102,446,000     $ 1,802,000
Principal Balance Repaid $ 35,470,000               $ 17,278,000    
Hickory Point Mall                      
Debt Instrument [Line Items]                      
Stated interest rate (as a percent)       5.85%              
Amount Financed or Extended       $ 27,446,000              
The Outlet Shoppes At El Paso                      
Debt Instrument [Line Items]                      
Stated interest rate (as a percent)     5.10%         5.10%      
Amount Financed or Extended     $ 75,000,000                
Debt Instrument, Interest Rate, Effective Percentage           4.73%     4.73%    
Principal Balance Repaid           $ 6,525,000          
Honey Creek Mall                      
Debt Instrument [Line Items]                      
Debt Instrument, Interest Rate, Effective Percentage         8.00%            
Principal Balance Repaid         $ 23,539,000            
The Terrace                      
Debt Instrument [Line Items]                      
Debt Instrument, Interest Rate, Effective Percentage 7.25% 7.25%               7.25%  
Principal Balance Repaid   $ 11,931,000                  
Kirkwood Mall                      
Debt Instrument [Line Items]                      
Debt Instrument, Interest Rate, Effective Percentage             5.75%        
Principal Balance Repaid             $ 37,295,000        
Fixed Rate Operating Loans                      
Debt Instrument [Line Items]                      
Weighted-average remaining term to maturity                   2 years 1 month 6 days  
Minimum | Fixed Rate Operating Loans                      
Debt Instrument [Line Items]                      
Interest rate of debt bearing fixed interest (as a percent) 4.36% 4.36%               4.36%  
Maximum | Fixed Rate Operating Loans                      
Debt Instrument [Line Items]                      
Interest rate of debt bearing fixed interest (as a percent) 6.50% 6.50%               6.50%