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Fair Value Disclosures (Measurements) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Marketable securities, unrealized gain     $ (100)     $ 200
Impairment of real estate $ 431 $ 5,962 1,898 $ 10,560    
Terminal capitalization rates           8.00%
Discount Rate            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Measurement input           8.00%
Erie Canal Centre            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Real estate investment, fair value 18,100   18,100      
Northmall Centre            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Real estate investment, fair value           $ 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
Spring Mall            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Real estate investment, fair value           4,900
Fair Value, Measurements, Recurring | Marketable Securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative asset 18,188   18,188     19,548
Fair Value, Measurements, Recurring | Interest Rate Derivatives            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative liability (19,516)   (19,516)     (28,225)
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 4,756   4,756     980
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 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 13,432   13,432     18,568
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 liability 19,516   19,516     (28,225)
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 liability 0   0     0
Fair Value, Measurements, Nonrecurring | Properties            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative asset 18,091   18,091     27,184
Impairment of real estate     431   $ 11,544  
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 $ 18,091   $ 18,091     $ 27,184