Investments in Partially Owned Entities (Urban Edge Properties and PREIT) (Details) $ / shares in Units, $ in Thousands	Sep. 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	$ 22.08
Equity method investment fair value	$ 126,235,000
Excess of investee's fair value over carrying amount	$ 80,837
PREIT
Schedule Of Equity Method Investments
Ownership common shares, investee (in shares) \| shares	6,250,000
Equity method ownership percentage	7.90%
Closing share price (in dollars per share) \| $ / shares	$ 9.46
Equity method investment fair value	$ 59,125
Excess of investee's fair value over carrying amount	2,389
Excess of investee's carrying amount over equity in net assets	$ 36,096
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.

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