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Investment in Consolidated and Unconsolidated Entities - Net Equity Investment and Share of Net Income (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of net equity investment and share of net income or loss |  |
Carrying value of investment | $ 188,135 | $ 180,764
IAGM Retail Fund I, LLC |  |
Schedule of net equity investment and share of net income or loss |  |
Ownership % | 55.00% |
Carrying value of investment | $ 128,286 | 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 | $ 59,961 | 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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