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)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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.

+ References

No definition available.

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Investments in Partially Owned Entities (Summary of Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Equity Method Investments
Carrying amount of investments in partially owned entities	$ 1,428,019	$ 1,550,422	$ 1,240,489
Partially Owned Office Buildings
Schedule Of Equity Method Investments
Carrying amount of investments in partially owned entities	$ 797,205	947,883
Alexanders Inc
Schedule Of Equity Method Investments
Equity method ownership percentage	32.40%
Carrying amount of investments in partially owned entities	$ 129,324	133,568
PREIT
Schedule Of Equity Method Investments
Equity method ownership percentage	8.00%
Carrying amount of investments in partially owned entities	$ 122,883	133,375
India real estate ventures
Schedule Of Equity Method Investments
Carrying amount of investments in partially owned entities	$ 30,290	48,310
India real estate ventures \| Minimum
Schedule Of Equity Method Investments
Equity method ownership percentage	4.10%
India real estate ventures \| Maximum
Schedule Of Equity Method Investments
Equity method ownership percentage	36.50%
UE
Schedule Of Equity Method Investments
Equity method ownership percentage	5.40%
Carrying amount of investments in partially owned entities	$ 24,523	25,351
Other investments
Schedule Of Equity Method Investments
Carrying amount of investments in partially owned entities	$ 323,794	$ 261,935