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Investment in Consolidated and Unconsolidated Entities - Unconsolidated Entities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Debt Maturities of the Unconsolidated Entities
Mortgage debt	$ 272,814	$ 272,629
IAGM Retail Fund I, LLC
Schedule of Debt Maturities of the Unconsolidated Entities
2019	31,353
2020	0
2021	23,150
2022	0
2023	180,125
Thereafter	40,680
Mortgage debt	$ 275,308

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