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Mortgage Loans Payable and Unsecured Credit Facility (Narrative) (Details) - USD ($)
3 Months Ended
Sep. 08, 2017
Mar. 31, 2020
May 14, 2020
Dec. 31, 2019
Line Of Credit Facility [Line Items]        
Credit facilities   $ 182,000,000   $ 106,000,000
Approximate amount of accumulated other comprehensive loss to be reclassified into earnings   6,900,000    
Interest Rate Swap [Member]        
Line Of Credit Facility [Line Items]        
Derivative, notional amount   $ 425,000,000   $ 425,000,000
Unsecured Credit Facility [Member]        
Line Of Credit Facility [Line Items]        
Credit facility borrowing capacity $ 300,000,000      
Aggregate borrowing capacity including increase under accordion feature $ 750,000,000      
Revolving Credit Facility [Member]        
Line Of Credit Facility [Line Items]        
Line of credit facility extension allowed period 1 year 1 year    
Basis spread on borrowings variable rate   1.50%    
Revolving Credit Facility [Member] | Subsequent Event [Member]        
Line Of Credit Facility [Line Items]        
Credit facility borrowing capacity     $ 31,000  
Credit facilities     $ 176,900,000  
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 $ 250,000,000      
Credit facility expiration date Sep. 08, 2021      
Basis spread on borrowings variable rate   0.14%    
Revolving Credit Facility [Member] | Unsecured Credit Facility [Member] | Minimum [Member]        
Line Of Credit Facility [Line Items]        
Basis spread on borrowings variable rate   0.10%    
Revolving Credit Facility [Member] | Unsecured Credit Facility [Member] | Maximum [Member]        
Line Of Credit Facility [Line Items]        
Basis spread on borrowings variable rate   0.15%    
Term loan facility [Member]        
Line Of Credit Facility [Line Items]        
Basis spread on borrowings variable rate   1.45%    
Term loan facility [Member] | Minimum [Member]        
Line Of Credit Facility [Line Items]        
Basis spread on borrowings variable rate 1.30%      
Term loan facility [Member] | Maximum [Member]        
Line Of Credit Facility [Line Items]        
Basis spread on borrowings variable rate 1.90%      
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 Sep. 08, 2022