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Investment in Consolidated and Unconsolidated Entities - Unconsolidated Entities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Debt Maturities of the Unconsolidated Entities |  |
Mortgage debt | $ 311,623 | $ 311,574
IAGM Retail Fund I, LLC |  |
Schedule of Debt Maturities of the Unconsolidated Entities |  |
2018 | 204,028 |
2019 | 16,250 |
2020 | 0 |
2021 | 23,150 |
2022 | 0 |
Thereafter | 68,805 |
Mortgage debt | 312,233 |
Recourse debt | $ 23,000 |

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