Investments in Partially Owned Entities (Summary of Income (Loss) ) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Schedule Of Equity Method Investments
Our share of net income (loss)	$ 7,320	$ (9,904)
Alexanders Inc
Schedule Of Equity Method Investments
Equity method ownership percentage	32.40%
Equity in net income (loss)	$ 5,717	(3,209)
Management, leasing and development fees	1,057	1,208
Our share of net income (loss)	6,774	(2,001)
Partially Owned Office Buildings
Schedule Of Equity Method Investments
Our share of net income (loss)	106	(4,283)
Other investments
Schedule Of Equity Method Investments
Our share of net income (loss)	$ 440	(3,620)
One Park Avenue
Schedule Of Equity Method Investments
Transfer tax		4,978
Alexanders Inc \| Kings Plaza Regional Shopping Center
Schedule Of Equity Method Investments
Transfer tax		$ 7,708

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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