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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

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 + Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 + Details
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