Investments in Partially Owned Entities (Urban Edge Properties and PREIT Associates L.P.) (Details) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2016 USD ($) $ / shares shares
Pennsylvania Real Estate Investment Trust [Member]
Schedule Of Equity Method Investments [Line Items]
Operating Partnership Units Received From Buyer \| shares	6,250,000
Equity method ownership percentage	8.10%
Closing share price (in dollars per share) \| $ / shares	$ 21.85
Equity Method Investment fair Value	$ 136,563
Excess of investee's fair value over carrying amount	8,495
Excess of investee's carrying amount over equity in net assets	$ 64,827
Urban Edge Properties [Member]
Schedule Of Equity Method Investments [Line Items]
Operating Partnership Units Received From Buyer \| shares	5,717,184
Equity method ownership percentage	5.40%
Closing share price (in dollars per share) \| $ / shares	$ 25.84
Equity Method Investment fair Value	$ 147,732
Excess of investee's fair value over carrying amount	$ 121,505

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6382943&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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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This item represents the aggregate value of each identified investment accounted for under the equity method of accounting based on the quoted market price for those investments in common stock for which a quoted market price is available.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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Amount of fair value of reporting unit in excess of carrying amount.

+ References

No definition available.

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- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

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Equity Method Investment Fair Value In Excess Of Carrying Amount

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- Definition

Number of Operating Partnership Units Received From Buyer

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