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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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