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Investment in Consolidated and Unconsolidated Entities - Maturity 3rd Party Mortgage Debt (Details) - IAGM Retail Fund I, LLC $ in Thousands	Nov. 02, 2018 USD ($)	Oct. 05, 2018 USD ($) property	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Unconsolidated entities third party mortgage debt				$ 275,308
Schedule of Debt Maturities of the Unconsolidated Entities
2019				31,353
2020				0
2021				23,150
2022				0
2023				180,125
Thereafter				40,680
Total				$ 275,308
Mortgages
Schedule of Debt Maturities of the Unconsolidated Entities
Extension term on non-recourse mortgage loan			1 year
Loans payable			$ 15,103
Debt extinguished		$ 38,300
Repayments of mortgage payable		$ 3,830
Number of retail properties | property		6
Debt instrument, face amount	$ 5,205
Senior Secured Term Loan
Schedule of Debt Maturities of the Unconsolidated Entities
Debt instrument, face amount	$ 152,000
Debt instrument, extension fee	0.10%
Senior Secured Term Loan | London Interbank Offered Rate (LIBOR)
Schedule of Debt Maturities of the Unconsolidated Entities
Stated interest rate (percent)	1.55%

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