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Mortgage Loans Payable and Unsecured Credit Facility (Narrative) (Details)
 6 Months Ended 9 Months Ended
Aug. 30, 2021
USD ($)
Term
May 05, 2021
USD ($)
Jun. 30, 2022
Sep. 30, 2022
USD ($)
PropertyPortfolio
Aug. 22, 2022
USD ($)
Dec. 31, 2021
USD ($)
Line Of Credit Facility [Line Items]            
Amount of debt maturities       $ 130,000,000    
Interest rate swaps assets       0    
Interest rate swaps liability       $ 0    
Number of property portfolio | PropertyPortfolio       19    
Interest Rate Swap [Member]            
Line Of Credit Facility [Line Items]            
Derivative, notional amount           $ 300,000,000.0
Interest Rate Swap [Member] | Discontinued Operations [Member] | Interest Income (Expense) [Member]            
Line Of Credit Facility [Line Items]            
Interest rate swaps termination benefit       $ 3,400,000    
Non-recourse Mortgage [Member]            
Line Of Credit Facility [Line Items]            
Maturity date   Jun. 01, 2031        
Interest at fixed-rate   3.49%        
Non-recourse Mortgage [Member] | Nonrecourse            
Line Of Credit Facility [Line Items]            
Non-recourse mortgage amount   $ 114,000,000.0        
KeyBank Credit Agreement [Member]            
Line Of Credit Facility [Line Items]            
Term loan amount         $ 130,000,000  
Unsecured Credit Facility [Member]            
Line Of Credit Facility [Line Items]            
Credit facility borrowing capacity $ 300,000,000          
Revolving Credit Facility [Member]            
Line Of Credit Facility [Line Items]            
Basis spread on borrowings variable rate     1.50%      
Revolving Credit Facility [Member] | Minimum [Member]            
Line Of Credit Facility [Line Items]            
Basis spread on borrowings variable rate 1.35%          
Revolving Credit Facility [Member] | Maximum [Member]            
Line Of Credit Facility [Line Items]            
Basis spread on borrowings variable rate 1.95%          
Revolving Credit Facility [Member] | Unsecured Credit Facility [Member]            
Line Of Credit Facility [Line Items]            
Credit facility borrowing capacity $ 185,000,000          
Line of credit facility extension allowed term | Term 2          
Term loan facility [Member] | Unsecured Credit Facility [Member]            
Line Of Credit Facility [Line Items]            
Credit facility borrowing capacity $ 50,000,000          
Line of credit facility extension allowed period 4 years