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Mortgage Loans Payable And Credit Facility (Narrative) (Details) - USD ($)
 6 Months Ended
Jun. 30, 2015
Feb. 05, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]      
Fair value of interest rate swaps included in accounts payable and accrued liabilities [1] $ 2,631,000   $ 2,777,000
Approximate amount of accumulated other comprehensive loss to be reclassified into earnings 3,800,000    
Unsecured revolving credit facility     $ 72,000,000
Interest Rate Swap [Member]      
Line of Credit Facility [Line Items]      
Fair value of interest rate swaps included in accounts payable and accrued liabilities 2,631,000    
Unsecured Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Credit facility borrowing capacity   $ 310,000,000  
Term loan amount $ 150,000,000 100,000,000  
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Credit facility borrowing capacity   260,000,000  
Credit facility expiration date Feb. 05, 2019    
Extension period 1 year    
Aggregate borrowing capacity including increase under accordion feature $ 750,000,000    
Basis spread on borrowings variable rate 1.35%    
Remaining borrowing capacity $ 215,600,000    
Minimum [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Basis spread on borrowings variable rate 1.35%    
Maximum [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Basis spread on borrowings variable rate 1.95%    
Term Loan [Member]      
Line of Credit Facility [Line Items]      
Basis spread on borrowings variable rate 1.30%    
Term Loan [Member] | Unsecured Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Credit facility expiration date Feb. 05, 2020    
Term loan amount   50,000,000  
Term Loan [Member] | Minimum [Member]      
Line of Credit Facility [Line Items]      
Basis spread on borrowings variable rate 1.30%    
Term Loan [Member] | Maximum [Member]      
Line of Credit Facility [Line Items]      
Basis spread on borrowings variable rate 1.90%    
Term Loan Maturing February 11, 2019 [Member]      
Line of Credit Facility [Line Items]      
Term loan amount $ 75,000,000    
Basis spread on borrowings variable rate 1.30%    
Debt term 5 years    
Loan maturity date Feb. 11, 2019    
Weighted-average interest rate 2.90%    
Term Loan Maturing February 11, 2019 [Member] | Minimum [Member]      
Line of Credit Facility [Line Items]      
Basis spread on borrowings variable rate 1.30%    
Term Loan Maturing February 11, 2019 [Member] | Maximum [Member]      
Line of Credit Facility [Line Items]      
Basis spread on borrowings variable rate 1.90%    
Term Loan Maturing February 11, 2021 [Member]      
Line of Credit Facility [Line Items]      
Term loan amount $ 75,000,000    
Basis spread on borrowings variable rate 1.70%    
Debt term 7 years    
Loan maturity date Feb. 11, 2021    
Weighted-average interest rate 4.00%    
Term Loan Maturing February 11, 2021 [Member] | Minimum [Member]      
Line of Credit Facility [Line Items]      
Basis spread on borrowings variable rate 1.70%    
Term Loan Maturing February 11, 2021 [Member] | Maximum [Member]      
Line of Credit Facility [Line Items]      
Basis spread on borrowings variable rate 2.30%    
Term Loan Maturing February 5, 2020 [Member]      
Line of Credit Facility [Line Items]      
Term loan amount   50,000,000  
Basis spread on borrowings variable rate 1.30%    
Debt term 5 years    
Loan maturity date Feb. 05, 2020    
Weighted-average interest rate 2.80%    
Term Loan Maturing February 5, 2020 [Member] | Minimum [Member]      
Line of Credit Facility [Line Items]      
Basis spread on borrowings variable rate 1.30%    
Term Loan Maturing February 5, 2020 [Member] | Maximum [Member]      
Line of Credit Facility [Line Items]      
Basis spread on borrowings variable rate 1.90%    
Term Loan Maturing February 5, 2022 [Member]      
Line of Credit Facility [Line Items]      
Term loan amount   $ 50,000,000  
Basis spread on borrowings variable rate 1.55%    
Debt term 7 years    
Loan maturity date Feb. 05, 2022    
Weighted-average interest rate 3.30%    
Term Loan Maturing February 5, 2022 [Member] | Minimum [Member]      
Line of Credit Facility [Line Items]      
Basis spread on borrowings variable rate 1.55%    
Term Loan Maturing February 5, 2022 [Member] | Maximum [Member]      
Line of Credit Facility [Line Items]      
Basis spread on borrowings variable rate 2.15%    
[1] Included in accounts payable and accrued liabilities in the accompanying consolidated balance sheets.