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For an unclassified balance sheet, the accumulated amortization, as of the reporting date, representing the periodic charge to earnings of deferred costs which are associated with debt obligations existing as of the end of the period.

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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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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 interest capitalized during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Glossary Allowance for Funds Used during Construction
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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 amount of a reclassification adjustment made to prior period financial statement amounts.

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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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Useful life on which depreciation was computed for entities with a substantial portion of business acquiring and holding investment real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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This amount represents Cash Considerations Transferred During Spin Off.

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Number of Operating Partnership Units Received From Buyer

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Basis of Presentation and Significant Accounting Policies (Details)		12 Months Ended
	Jan. 15, 2015 USD ($) Properties shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) Properties	Dec. 31, 2013 USD ($)
Basis of Presentation and Significant Accounting Policies [Abstract]
Interest Costs Capitalized		$ 59,305,000	$ 62,786,000
Debt Issuance Cost		7,720,000	11,549,000
Reclassification of signage revenue from fee and other income to property rentals			37,929,000	$ 32,866,000
Reclassification of debt issuance costs		79,987,000
Real Estate Properties [Line Items]
Cash Considerations Transferred During Spin Off (in US Dollars)		$ 225,000,000	$ 0	$ 0
Retail Segment Strip Shopping Centers [Member] \| Discontinued Operations [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties \| Properties			22
Urban Edge Properties [Member]
Real Estate Properties [Line Items]
Operating Partnership Units Received From Buyer \| shares	5,717,184
Urban Edge Properties [Member] \| Discontinued Operations [Member]
Real Estate Properties [Line Items]
Cash Considerations Transferred During Spin Off (in US Dollars)	$ 225,000,000
Equity method ownership percentage	5.40%
Urban Edge Properties [Member] \| Warehouse [Member] \| Discontinued Operations [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties \| Properties	1
Urban Edge Properties [Member] \| Retail Segment Strip Shopping Centers [Member] \| Discontinued Operations [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties \| Properties	79
Urban Edge Properties [Member] \| Retail Segment Regional Malls [Member] \| Discontinued Operations [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties \| Properties	3
Maximum [Member]
Property Plant And Equipment [Line Items]
Real Estate And Accumulated Depreciation Life Used For Depreciation		40 years
Minimum [Member]
Property Plant And Equipment [Line Items]
Real Estate And Accumulated Depreciation Life Used For Depreciation		7 years