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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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
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-SubTopic 10
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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- 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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

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

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No definition available.

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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.

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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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-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
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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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The amount of asset impairment charges reported by an equity method investment of the entity.

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No definition available.

+ Details

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- Definition

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

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No definition available.

+ Details

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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.

+ Details

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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.

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No definition available.

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

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No definition available.

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Number of Real Estate Properties Acquired

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No definition available.

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

+ References

No definition available.

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Investment In Real Estate Joint Ventures And Partnerships (Narrative) (Details) $ in Thousands		1 Months Ended			3 Months Ended				12 Months Ended
	Feb. 12, 2016 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Feb. 29, 2016 USD ($) center	Dec. 31, 2017 USD ($) center	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) property center	Dec. 31, 2016 USD ($) property center	Dec. 31, 2015 USD ($) center	Oct. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Net basis differentials for equity method investments					$ 2,200				$ 2,200	$ 2,600
Impairment loss									0	1,303	$ 7,487
Fees earned from real estate joint ventures and partnerships									$ 6,200	5,100	4,500
Number of centers sold				1					18
Proceeds from sale and disposition of property									$ 446,600
Gain on sale of property					1,500	$ (3,300)	$ 1,100	$ 5,900	218,611	100,714	$ 59,621
Recognized identifiable assets acquired and liabilities assumed, land					$ 1,241,004				$ 1,241,004	$ 1,196,770
Number of real estate properties \| center					2				2	2
Assets held by joint venture					$ 4,196,639				$ 4,196,639	$ 4,426,928
Debt held by joint venture					$ 2,006,285				$ 2,006,285
Proceeds from business acquisition				$ 2,500
51% Owned Real Estate joint venture [Member]
Schedule of Equity Method Investments [Line Items]
Equity interest in joint venture (percent)											51.00%
Number of real estate properties \| center											3
Assets held by joint venture											$ 43,700
Debt held by joint venture											$ 72,400
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									2	5
Proceeds from sale and disposition of property									$ 19,600	$ 78,700
Gain on sale of property									$ 6,200	$ 3,900
Number of real estate properties acquired \| property										1
Gross payments to acquire real estate		$ 23,500								$ 73,000
Recognized identifiable assets acquired and liabilities assumed, land												$ 4,400
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]
Percentage of voting interest acquired			50.00%				50.00%			50.00%
Equity interest in joint venture			$ 13,500							$ 13,579
Business Combination Achieved in Stages [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of voting interest acquired	49.00%			49.00%
Equity interest in joint venture	$ 22,514
Proceeds from business acquisition	$ 2,500
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures					20.00%				20.00%	20.00%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures					90.00%				90.00%	75.00%