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Investment in Partially Owned Entities (Details 1) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Schedule of net equity investment and share of net income or loss
Investment	$ 182,213	$ 178,728
IAGM Retail Fund I, LLC [Member]
Schedule of net equity investment and share of net income or loss
Description	Multi-tenant retail shopping centers
Ownership %	55.00%
Investment	$ 126,451	126,090
Downtown Railyard Venture, LLC [Member]
Schedule of net equity investment and share of net income or loss
Description	Land development
Investment	$ 55,508	52,365
Other Unconsolidated Entities [Member]
Schedule of net equity investment and share of net income or loss
Description	Various real estate investments
Investment	$ 254	$ 273

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Schedule of equity method investments.

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A description of the principal activities of an investee accounted for under the equity method.

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- Definition

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

+ References

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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