Variable Interest Entities (Summary Of Unconsolidated Variable Interest Entities) (Details) - Unconsolidated Variable Interest Entities [Member] $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2017 USD ($) joint_venture	Dec. 31, 2016 USD ($) joint_venture
Variable Interest Entity [Line Items]
Investment in real estate joint ventures and partnerships, net	$ 31,199	$ 886
Maximum risk of loss	$ 34,000	$ 34,000
Number of joint venture arrangements \| joint_venture	1	1
Other Liabilities [Member]
Variable Interest Entity [Line Items]
Investment in real estate joint ventures and partnerships, net	$ (6,000)	$ (9,000)

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5747-111685

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Net carrying amount of the assets and liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), when the reporting entity is not the VIE's primary beneficiary.

+ References

No definition available.

+ Details

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- Definition

Variable Interest Entity, Qualitative or Quantitative Information, Number of Joint Venture Arrangements

+ References

No definition available.

+ Details

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- Details

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