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Mortgage Loans Payable and Credit Facility (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 08, 2017
Jun. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Line Of Credit Facility [Line Items]        
Approximate amount of accumulated other comprehensive income to be reclassified into earnings     $ 1,400,000  
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]        
Credit facility borrowing capacity     $ 116,000,000  
Line of credit facility extension allowed period 1 year   1 year  
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 $ 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