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Mortgage Loans Payable and Unsecured Credit Facilities (Narrative) (Details)
 12 Months Ended
Aug. 30, 2021
USD ($)
Term
May 05, 2021
USD ($)
Dec. 31, 2021
USD ($)
Term
Dec. 31, 2020
USD ($)
Aug. 04, 2020
USD ($)
Line Of Credit Facility [Line Items]          
Credit facilities     $ 66,000,000 $ 175,000,000  
Approximate amount of accumulated other comprehensive loss to be reclassified into earnings     4,900,000    
Interest Rate Swap [Member]          
Line Of Credit Facility [Line Items]          
Interest rate swaps liability     8,200,000    
Derivative, notional amount     300,000,000.0 $ 425,000,000.0  
Non-recourse Mortgage [Member]          
Line Of Credit Facility [Line Items]          
Non-recourse mortgage amount   $ 114,000,000.0      
Maturity date   Jun. 01, 2031      
Interest at fixed-rate   3.49%      
Unsecured Credit Facility [Member]          
Line Of Credit Facility [Line Items]          
Credit facility borrowing capacity $ 300,000,000       $ 300,000,000
Revolving Credit Facility [Member]          
Line Of Credit Facility [Line Items]          
Credit facility borrowing capacity     $ 113,900,000    
Line of credit facility extension allowed term | Term     2    
Line of credit facility extension allowed period     1 year    
Basis spread on borrowings variable rate     1.50%    
Credit facilities     $ 66,000,000.0    
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        
Credit facility expiration date Aug. 31, 2024        
Line of credit facility extension allowed term | Term 2        
Line of credit facility extension allowed period 1 year        
Term loan facility [Member] | Unsecured Credit Facility [Member]          
Line Of Credit Facility [Line Items]          
Credit facility borrowing capacity $ 50,000,000        
Credit facility expiration date Aug. 31, 2026        
Line of credit facility extension allowed period 4 years