Variable Interest Entities (Summary Of Consolidated Variable Interest Entities) (Details) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2018 USD ($) joint_venture	Dec. 31, 2017 USD ($) joint_venture
Variable Interest Entity [Line Items]
Number of VIE real estate joint ventures guaranteed by company \| joint_venture	1	1
Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Assets Held by VIEs	$ 227,164	$ 235,713
Assets Held as Collateral for Debt	40,665	42,979
Maximum Risk of Loss	$ 29,784	$ 29,784

Amount of consolidated variable interest entity's (VIE) assets that can only be used to settle obligations of VIE.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6839525&loc=SL6758485-165988

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5710-111685

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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-Section 50
-Paragraph 6
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5728-111685

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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.

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- Definition

Variable Interest Entity, Qualitative or Quantitative Information, Number of VIE's Guaranteed by Company

+ References

No definition available.

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