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Mortgage Loans Payable and Unsecured Credit Facility (Summary of Derivative Financial Instruments Held) (Details) - Interest Rate Swap [Member]
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
contract
Dec. 31, 2019
USD ($)
contract
Cash Flow Hedging, Count 7 [Member]    
Derivatives Fair Value [Line Items]    
Count | contract 7  
Fair value | $ $ 22,062,000  
Cash Flow Hedging, Count 7 [Member] | Minimum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates 2020  
Cash Flow Hedging, Count 7 [Member] | Maximum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates 2025  
Cash Flow Hedging, Count 2 [Member]    
Derivatives Fair Value [Line Items]    
Count | contract   2
Fair value | $   $ 136,000
Cash Flow Hedging, Count 2 [Member] | Minimum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates   2020
Cash Flow Hedging, Count 2 [Member] | Maximum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates   2023
Cash Flow Hedging, Count 6 [Member]    
Derivatives Fair Value [Line Items]    
Count | contract   6
Fair value | $   $ 7,180,000
Cash Flow Hedging, Count 6 [Member] | Minimum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates   2021
Cash Flow Hedging, Count 6 [Member] | Maximum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates   2025