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Investment in Unconsolidated Entities - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) derivative_instrument	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items]
Investment in unconsolidated entities	$ 117,220		$ 118,861
Deferred gain on sale of property	$ 958
Equity investment basis adjustment, amortization period	30 years
Retail
Variable Interest Entity [Line Items]
Purchase price	$ 33,204	$ 86,750
IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Ownership percentage	55.00%		55.00%
Investment in unconsolidated entities	$ 117,220		$ 118,861
IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Repayment of mortgage note payable	14,872
Gain on sale	1,741
Antoine Town Center | Retail
Variable Interest Entity [Line Items]
Purchase price	22,254
Interest Rate Swap
Variable Interest Entity [Line Items]
Derivative liability	$ 131
Interest Rate Swap | IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Number of derivatives held | derivative_instrument	2
Variable rate	1.55%
Derivative liability	$ 238
Interest Rate Swap, Effective Date April 1, 2020, 1.979% Fixed Interest | IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Notional amount	$ 45,000
Fixed interest rate	1.979%
Interest Rate Swap, Effective Date April 1, 2020, 1.956% Fixed Interest | IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Notional amount	$ 30,000
Fixed interest rate	1.956%

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