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Fair Value Disclosures (Measurements) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of real estate   $ 19,551 $ 24,402 $ 53,295
Northmall Centre        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Real estate investment, fair value $ 14,000 14,000    
The Pines Shopping Center        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Real estate investment, fair value 8,300 8,300    
Spring Mall        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Real estate investment, fair value 4,900 4,900    
Brice Park        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Real estate investment, fair value 9,700 9,700    
Mohawk Acres Plaza        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Real estate investment, fair value 9,100 9,100    
Lincoln Plaza        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Real estate investment, fair value 3,400 3,400    
Lakes Crossing        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Real estate investment, fair value $ 1,300 1,300    
Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable securities, unrealized losses   (200) (100)  
Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Terminal capitalization rates 8.00%      
Minimum | Discount Rate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rates 8.00%      
Fair Value, Measurements, Recurring | Marketable Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset $ 19,548 19,548 18,054  
Fair Value, Measurements, Recurring | Interest Rate Derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset     3,795  
Derivative liability (28,225) (28,225) (13,449)  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Marketable Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 980 980 1,459  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest Rate Derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset     0  
Derivative liability 0 0 0  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Marketable Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 18,568 18,568 16,595  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest Rate Derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset     3,795  
Derivative liability 28,225 28,225 (13,449)  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Marketable Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 0 0 0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest Rate Derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset     0  
Derivative liability 0 0 0  
Fair Value, Measurements, Nonrecurring | Properties        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 27,184 27,184 23,533  
Impairment of real estate   11,544 7,983  
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Properties        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 0 0 0  
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Properties        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 0 0 0  
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Properties        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset $ 27,184 $ 27,184 $ 23,533