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Equity Investment Basis Adjustment, Amortization Period

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Equity Method Investment Contributions

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Gain and loss is the difference between the fair value of the asset(s) being contributed and the fair value of the equity interest an investor is receiving.

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Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Properties Contributed

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Area of a real estate property.

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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-Name Accounting Standards Codification
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-Section 45
-Paragraph 2
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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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A description of the principal activities of an investee accounted for under the equity method.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
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-Section 50
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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.

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-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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Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21D
-URI http://asc.fasb.org/extlink&oid=98514028&loc=SL94080555-108585

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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.

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Investment in Consolidated and Unconsolidated Entities - Schedule of Joint Ventures (Details) $ in Thousands			12 Months Ended
	Jul. 01, 2013 USD ($)	Apr. 17, 2013 USD ($) ft² Properties	Dec. 31, 2017 USD ($) ft²	Dec. 31, 2016 USD ($) ft²	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)
Schedule of Equity Method Investments [Line Items]
Area of real estate property \| ft²			501,276	322,326
Loss on contribution to joint venture			$ 0	$ 0	$ (12,919)
Contributions to unconsolidated entities			6,875	7,200	35,326
Schedule of net equity investment and share of net income or loss
Investment			180,764	178,728
Unconsolidated Entities [Member]
Schedule of net equity investment and share of net income or loss
Investment			$ 180,764	178,728
Unconsolidated Entities [Member] \| IAGM Retail Fund I, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments in joint ventures, properties contributed \| Properties		13
Area of real estate property \| ft²		2,109,324
Gross Disposition Price	$ 34,350	$ 409,280
Amortization period for the basis adjustment			30 years
Schedule of net equity investment and share of net income or loss
Description			Multi-tenant retail shopping centers
Ownership %			55.00%
Investment		96,788	$ 123,693	126,090
Unconsolidated Entities [Member] \| Downtown Railyard Venture, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Debt instrument, face amount						$ 18,088
Stated interest rate (percent)						4.00%
Loss on contribution to joint venture					12,919
Proceeds from equity method investment, dividends or distributions, return of capital					4,092
Contributions to unconsolidated entities					$ 3,000
Schedule of net equity investment and share of net income or loss
Description			Land development
Ownership %			90.00%
Investment			$ 57,183	52,365		$ 46,174
Unconsolidated Entities [Member] \| Other Unconsolidated Entities [Member]
Schedule of net equity investment and share of net income or loss
Description			Various real estate investments
Investment			$ (112)	$ 273
PGGM Private Real Estate Fund [Member] \| IAGM Retail Fund I, LLC [Member]
Schedule of net equity investment and share of net income or loss
Investment		$ 79,190