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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, 2019 USD ($) contract	Dec. 31, 2018 USD ($) contract
Cash Flow Hedging, Count 1 [Member]
Derivatives Fair Value [Line Items]
Count | contract	1
Fair value | $	$ 74,000
Maturity dates	2020
Cash Flow Hedging, Count 7 [Member]
Derivatives Fair Value [Line Items]
Count | contract	7	7
Fair value | $	$ 9,961,000	$ 8,871,000
Cash Flow Hedging, Count 7 [Member] | Minimum [Member]
Derivatives Fair Value [Line Items]
Maturity dates	2021	2019
Cash Flow Hedging, Count 7 [Member] | Maximum [Member]
Derivatives Fair Value [Line Items]
Maturity dates	2025	2024
Cash Flow Hedging, Count 2 [Member]
Derivatives Fair Value [Line Items]
Count | contract		2
Fair value | $		$ 1,576,000
Maturity dates		2025

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+ References

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+ References

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- Definition

Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
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- Definition

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-Paragraph 1A
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