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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, 2018 USD ($) contract | Dec. 31, 2017 USD ($) contract
Derivatives Fair Value [Line Items] |  |
Count | contract |  | 1
Fair value | $ |  | $ 511,000
Maturity dates |  | 2021
Cash Flow Hedging, Count 7 [Member] |  |
Derivatives Fair Value [Line Items] |  |
Count | contract | 9 |
Fair value | $ | $ 15,755,000 |
Cash Flow Hedging, Count 7 [Member] | Minimum [Member] |  |
Derivatives Fair Value [Line Items] |  |
Maturity dates | 2019 |
Cash Flow Hedging, Count 7 [Member] | Maximum [Member] |  |
Derivatives Fair Value [Line Items] |  |
Maturity dates | 2025 |
Cash Flow Hedging, Count 6 [Member] |  |
Derivatives Fair Value [Line Items] |  |
Count | contract |  | 6
Fair value | $ |  | $ 6,394,000
Cash Flow Hedging, Count 6 [Member] | Minimum [Member] |  |
Derivatives Fair Value [Line Items] |  |
Maturity dates |  | 2019
Cash Flow Hedging, Count 6 [Member] | Maximum [Member] |  |
Derivatives Fair Value [Line Items] |  |
Maturity dates |  | 2024

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