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Mortgage Loans Payable And Unsecured Credit Facilities (Summary Of The Derivative Financial Instruments Held) (Details) - Interest Rate Swap [Member] | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) contract | Dec. 31, 2015 USD ($) contract
Derivatives Fair Value [Line Items] |  |
Count | contract | 2 | 4
Notional value | $ 150,000,000 | $ 250,000,000
Fair value | $ 2,321,000 | $ 3,945,000
Minimum [Member] |  |
Derivatives Fair Value [Line Items] |  |
Maturity dates | 2019 | 2019
Maximum [Member] |  |
Derivatives Fair Value [Line Items] |  |
Maturity dates | 2021 | 2022
Cash Flow Hedging, Count 3 [Member] |  |
Derivatives Fair Value [Line Items] |  |
Count | contract | 3 |
Notional value | $ 200,000,000 |
Fair value | $ 3,074,000 |
Cash Flow Hedging, Count 3 [Member] | Minimum [Member] |  |
Derivatives Fair Value [Line Items] |  |
Maturity dates | 2020 |
Cash Flow Hedging, Count 3 [Member] | Maximum [Member] |  |
Derivatives Fair Value [Line Items] |  |
Maturity dates | 2023 |

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- Definition Nominal or face amount used to calculate payments on the derivative liability. + 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 -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: 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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- 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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