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.

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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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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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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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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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Amount of gain (loss) on sale or disposal of an equity method investment.

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No definition available.

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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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The increase (decrease) during the reporting period in the amount due to the reporting entity for good and services provided to the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management, an entity and its principal owners, management, member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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

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No definition available.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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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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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.

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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.

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

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No definition available.

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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.

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No definition available.

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

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Number of Real Estate Properties Acquired

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

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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 ($)	Sep. 30, 2016 USD ($)	Feb. 29, 2016 USD ($) center	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) property center	Dec. 31, 2015 USD ($) property center	Dec. 31, 2014 USD ($)	Oct. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Net basis differentials for equity method investments						$ 2,600	$ 4,900
Impairment loss						1,303	7,487	$ 1,526
Fees earned from real estate joint ventures and partnerships						5,100	4,500	4,600
Repayments of long-term debt						$ 144,788	240,505	508,997
Number of centers sold			1			12
Proceeds from sale and disposition of property						$ 241,900
Gain on sale of property				$ 1,100	$ 5,900	100,714	59,621	190,872
Gross payments to acquire real estate						464,600
Recognized identifiable assets acquired and liabilities assumed, land						$ 1,196,770	$ 1,290,784
Number of real estate properties \| center						2	2
Assets held by joint venture						$ 4,426,928	$ 3,901,945
Debt held by joint venture						2,034,998
Proceeds from business acquisition			$ 2,500
Gain from sale of real estate joint venture and partnership interests						$ 48,322	$ 879	$ 1,718
50% Owned Unconsolidated Real Estate Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures							50.00%
Number of centers sold \| property						5	1
Proceeds from sale and disposition of property						$ 78,700	$ 1,100
Gain on sale of property						$ 3,900	600
Gain from sale of real estate joint venture and partnership interests							$ 900
51% Owned Real Estate joint venture [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures						69.00%	51.00%
Number of real estate properties acquired \| property						1
Gross payments to acquire real estate						$ 73,000	$ 54,100
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]
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%
20% Owned Unconsolidated Real Estate Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Number of centers sold \| property							3
Proceeds from sale and disposition of property							$ 17,600
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of property							$ 1,000
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%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures						75.00%	75.00%
Joint Venture [Member] \| Collection of Outstanding Receivable [Member]
Schedule of Equity Method Investments [Line Items]
Increase (decrease) in accounts receivable, related party						$ 4,800