Investments in Partially Owned Entities (Urban Edge Properties and PREIT) (Details) $ / shares in Units, $ in Thousands	Jun. 30, 2018 USD ($) $ / shares shares
UE
Schedule Of Equity Method Investments
Equity method ownership percentage	4.50%
Closing share price (in dollars per share) \| $ / shares	$ 22.87
Equity method investment fair value	$ 130,752
Excess of investee's fair value over carrying amount	$ 86,792
PREIT
Schedule Of Equity Method Investments
Ownership common shares, investee (in shares) \| shares	6,250,000
Equity method ownership percentage	8.00%
Closing share price (in dollars per share) \| $ / shares	$ 10.99
Equity method investment fair value	$ 68,688
Excess of investee's fair value over carrying amount	5,448
Excess of investee's carrying amount over equity in net assets	$ 33,782
Partnership Interest \| UE
Schedule Of Equity Method Investments
Ownership common shares, investee (in shares) \| shares	5,717,184

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
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-Section 50
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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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Balance held at close of period in number of shares.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 320
-Section S99
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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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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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Equity Method Investment Fair Value In Excess Of Carrying Amount

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