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Mortgage Loans Payable and Unsecured Credit Facility (Summary of Derivative Financial Instruments Held) (Details) - Interest Rate Swap [Member]
6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
contract
Dec. 31, 2021
USD ($)
contract
Cash Flow Hedging, Count 2 [Member]    
Derivatives Fair Value [Line Items]    
Count | contract 4  
Fair value | $ $ 3,176,000  
Cash Flow Hedging, Count 2 [Member] | Minimum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates 2023  
Cash Flow Hedging, Count 2 [Member] | Maximum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates 2025  
Cash Flow Hedging, Count 3 [Member]    
Derivatives Fair Value [Line Items]    
Count | contract 1  
Fair value | $ $ 20,000  
Cash Flow Hedging, Count 3 [Member] | Minimum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates 2023  
Cash Flow Hedging, Count 3 [Member] | Maximum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates 2025  
Cash Flow Hedging, Count 5 [Member]    
Derivatives Fair Value [Line Items]    
Count | contract   5
Fair value | $   $ 8,232,000
Cash Flow Hedging, Count 5 [Member] | Minimum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates   2023
Cash Flow Hedging, Count 5 [Member] | Maximum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates   2025