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Investment in Consolidated and Unconsolidated Entities - Unconsolidated Entities (Details) $ in Thousands | Oct. 05, 2018 USD ($) Properties | Nov. 02, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | --- | ---
Schedule of Debt Maturities of the Unconsolidated Entities |  |  |  |
Mortgage debt |  |  | $ 311,699 | $ 311,574
IAGM Retail Fund I, LLC |  |  |  |
Schedule of Debt Maturities of the Unconsolidated Entities |  |  |  |
2018 |  |  | 188,925 |
2019 |  |  | 31,353 |
2020 |  |  | 0 |
2021 |  |  | 23,150 |
2022 |  |  | 0 |
Thereafter |  |  | 68,805 |
Mortgage debt |  |  | 312,233 |
Mortgages payable | IAGM Retail Fund I, LLC |  |  |  |
Schedule of Debt Maturities of the Unconsolidated Entities |  |  |  |
Loans payable |  |  | 15,103 |
Recourse debt |  |  | $ 23,000 |
Subsequent Event | Mortgages payable | IAGM Retail Fund I, LLC |  |  |  |
Schedule of Debt Maturities of the Unconsolidated Entities |  |  |  |
Debt extinguished | $ 38,300 |  |  |
Number of retail properties | Properties | 2 |  |  |
Subsequent Event | Senior Secured Term Loan | IAGM Retail Fund I, LLC |  |  |  |
Schedule of Debt Maturities of the Unconsolidated Entities |  |  |  |
Debt facility |  | $ 152,000 |  |

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