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Mortgage Loans Payable and Credit Facility (Summary of Derivative Financial Instruments Held) (Details) - Interest Rate Swap [Member]
9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
contract
Dec. 31, 2016
USD ($)
contract
Derivatives Fair Value [Line Items]    
Count | contract 2 2
Fair value | $ $ 1,392,000 $ 2,321,000
Minimum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates 2019 2019
Maximum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates 2021 2021
Cash Flow Hedging, Count 3 [Member]    
Derivatives Fair Value [Line Items]    
Count | contract 5 3
Fair value | $ $ 3,614,000 $ 3,074,000
Cash Flow Hedging, Count 3 [Member] | Minimum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates 2020 2020
Cash Flow Hedging, Count 3 [Member] | Maximum [Member]    
Derivatives Fair Value [Line Items]    
Maturity dates 2024 2023