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Investment in Consolidated and Unconsolidated Entities - Net Equity Investment and Share of Net Income (Details) $ in Thousands, ft² in Millions | Mar. 31, 2018 USD ($) | Mar. 31, 2018 Properties | Mar. 31, 2018 ft² | Mar. 31, 2018 | Dec. 31, 2017 USD ($) ft² Properties | Mar. 31, 2017 ft²
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Schedule of net equity investment and share of net income or loss |  |  |  |  |  |
Carrying value of investment | $ 188,714 |  |  |  | $ 180,764 |
Number of retail properties |  | 14 |  | 2 | 15 |
Square Feet | ft² |  |  | 3.0 |  | 3.2 | 0.3
IAGM Retail Fund I, LLC |  |  |  |  |  |
Schedule of net equity investment and share of net income or loss |  |  |  |  |  |
Ownership % |  |  |  | 55.00% |  |
Carrying value of investment | 131,603 |  |  |  | $ 123,693 |
Downtown Railyard Venture, LLC |  |  |  |  |  |
Schedule of net equity investment and share of net income or loss |  |  |  |  |  |
Ownership % |  |  |  | 90.00% |  |
Carrying value of investment | 57,223 |  |  |  | 57,183 |
Other unconsolidated entities |  |  |  |  |  |
Schedule of net equity investment and share of net income or loss |  |  |  |  |  |
Carrying value of investment | $ (112) |  |  |  | $ (112) |

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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 + Details
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- Definition 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 + Details
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