Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)(1)
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- Definition

Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
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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/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
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-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
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-Name Accounting Standards Codification
-Topic 946
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

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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

The amount of asset impairment charges reported by an equity method investment of the entity.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The amount of real estate property assets reported by an equity method investment of the entity.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- 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.

+ Details

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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.

+ Details

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

+ References

No definition available.

+ Details

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Data Type:	xbrli:decimalItemType
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Number of Real Estate Properties Acquired

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No definition available.

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Balance Type:	na
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- Definition

The cash inflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

No definition available.

+ Details

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Investment In Real Estate Joint Ventures And Partnerships (Narrative) (Details)	1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Feb. 29, 2016 USD ($) center	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) property	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) property	Oct. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) center
Schedule of Equity Method Investments [Line Items]
Net basis differentials for equity method investments				$ 2,400,000		$ 2,400,000		$ 2,600,000
Impairment loss				0	$ 0	0	$ 1,303,000
Management fees revenues, related parties				1,400,000	$ 1,200,000	$ 4,400,000	3,500,000
Number of centers sold			1			12
Proceeds from sale and disposition of property						$ 223,200,000
Gain on sale of property						86,566,000	$ 68,298,000
Property				1,236,463,000		1,236,463,000		1,196,770,000
Assets				4,313,190,000		4,313,190,000		$ 4,426,928,000
Debt, net				$ 2,011,789,000		$ 2,011,789,000
Proceeds to acquire businesses, gross			$ 2,500,000
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures		20.00%		20.00%	20.00%	20.00%	20.00%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures		75.00%		90.00%	75.00%	90.00%	75.00%
51% Owned Real Estate joint venture [Member]
Schedule of Equity Method Investments [Line Items]
Equity interest in acquiree, percentage										51.00%
Number of real estate properties \| center										3
Assets										$ 43,700,000
Debt, net										$ 72,400,000
Unconsolidated Real Estate Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures								69.00%
Number of centers sold \| property						1		5
Proceeds from sale and disposition of property						$ 6,000,000		$ 78,700,000
Gain on sale of property						$ 2,000,000		3,900,000
Gross acquisition purchase price	$ 23,500,000							$ 73,000,000
Number of real estate properties acquired \| property								1
Property									$ 4,400,000
90% Owned Real Estate Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures				90.00%		90.00%
Series of Individually Immaterial Business Acquisitions [Member]
Schedule of Equity Method Investments [Line Items]
Business acquisition, percentage of voting interests acquired		50.00%			50.00%		50.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value		$ 13,500,000
Business Combination Achieved in Stages [Member]
Schedule of Equity Method Investments [Line Items]
Business acquisition, percentage of voting interests acquired			49.00%