The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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)
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- Definition

Impairment losses measured as the amount by which the carrying amount of the business or real estate partnerships exceeds the fair value of the business or partnership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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-Section 45
-Paragraph 28
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- Definition

A tax based on the assessed value of real estate by the local government. The tax is usually based on the value of property (including the land).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 30
-Section 45
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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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Management Leasing And Development Fees

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Investments in Partially Owned Entities (Summary of Income (Loss) ) (Details) - USD ($) $ in Thousands		3 Months Ended
	Mar. 01, 2011	Mar. 31, 2018	Mar. 31, 2017
Schedule Of Equity Method Investments
Our share of net income (loss)		$ (9,904)	$ 1,358
Partially Owned Office Buildings
Schedule Of Equity Method Investments
Our share of net income (loss)		$ (4,283)	810
Alexanders Inc
Schedule Of Equity Method Investments
Equity method ownership percentage		32.40%
Our share of net income (loss)		$ (2,001)	8,401
Equity in net (loss) income		(3,209)	6,892
Management, leasing and development fees		$ 1,208	1,509
UE
Schedule Of Equity Method Investments
Equity method ownership percentage		4.50%
Our share of net income (loss)		$ (641)	1,300
Equity in net (loss) income		(717)	1,091
Management, leasing and development fees		$ 76	209
PREIT
Schedule Of Equity Method Investments
Equity method ownership percentage		8.00%
Equity in net (loss) income		$ (429)	(2,830)
Other investments
Schedule Of Equity Method Investments
Our share of net income (loss)		(2,550)	$ (6,323)
One Park Avenue
Schedule Of Equity Method Investments
Real estate transfer tax	$ 3,000	4,978
Kings Plaza Regional Shopping Center
Schedule Of Equity Method Investments
Equity in net (loss) income		$ (7,708)