Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

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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

Gross purchase price from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

+ References

No definition available.

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- Definition

Gross cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

+ References

No definition available.

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- Definition

The number of real estate properties, buildings or undeveloped land parcels sold during the period.

+ References

No definition available.

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Investment In Real Estate Joint Ventures And Partnerships (Narrative) (Details) $ in Thousands	1 Months Ended	9 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) property	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) property
Schedule of Equity Method Investments [Line Items]
Net basis differentials for equity method investments		$ 4,400		$ 2,200
Number of centers sold \| property		17
Proceeds from sale and disposition of property		$ 381,700
Gain on sale of property		$ 173,077	$ 86,566
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures		20.00%	20.00%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures		90.00%	90.00%
Unconsolidated Real Estate Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures			90.00%
Number of centers sold \| property				2
Proceeds from sale and disposition of property		$ 33,900		$ 19,600
Gain on sale of property		$ 6,300		$ 6,200
Gross acquisition purchase price	$ 23,500