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Investment in Consolidated and Unconsolidated Entities - Unconsolidated Entities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
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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