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Real Estate (Narrative) (Details)
9 Months Ended
May 05, 2021
USD ($)
ft²
ShoppingCenter
$ / ft²
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Real Estate Properties [Line Items]      
Impairment charges   $ 80,887,000 $ 7,607,000
Contributed capital to joint venture   3,193,000  
Investment in Unconsolidated Joint Venture [Member]      
Real Estate Properties [Line Items]      
Area of commercial building | ft² 258,000    
Area of commercial space leased percentage 100.00%    
Term of lease 20 years 10 months    
Number of redevelopment of existing shopping centers | ShoppingCenter 2    
Initial term of construction loan 3 years    
Percentage of interest in joint venture 10.00%    
Development cost sold to Joint Venture   8,000,000.0  
Initial annual net rent amount to be paid upon completion of building $ 5,400,000    
Annual escalator percentage to be paid on each anniversary of rent commencement 2.50%    
Operating costs, property taxes and amortization of tenant improvements $ 8,100,000    
Annual net rent amount to be paid upon completion of building $ 13,500,000    
Free rent period 10 months    
Tenant credit against either annual rent or any other tenant payment obligations including tenant improvement costs, in excess of tenant improvement allowance $ 6,800,000    
Amortized over period 240 months    
Investment in Unconsolidated Joint Venture [Member] | Between the 10th and 12th Lease Years [Member]      
Real Estate Properties [Line Items]      
Additional per rentable square foot tenant improvement allowance to be contributed | $ / ft² 9.38    
Investment in Unconsolidated Joint Venture [Member] | Maximum [Member]      
Real Estate Properties [Line Items]      
Construction financing maximum amount $ 105,000,000    
Joint venture contribution to be made per rentable square foot toward cost of tenant improvements | $ / ft² 155    
Investment in Unconsolidated Joint Venture [Member] | LIBOR Rate [Member]      
Real Estate Properties [Line Items]      
Construction loan initial interest LIBOR plus 200 basis    
Basis spread on borrowings variable rate 200.00%    
Investment in Unconsolidated Joint Venture [Member] | Office Space [Member]      
Real Estate Properties [Line Items]      
Area of commercial building | ft² 240,000    
Investment in Unconsolidated Joint Venture [Member] | Street-Level Retail [Member]      
Real Estate Properties [Line Items]      
Area of commercial building | ft² 18,000    
Dual-track Strategic Alternatives Process [Member]      
Real Estate Properties [Line Items]      
Impairment charges   $ 82,700,000