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Investment in Unconsolidated Entities - Narrative (Details)		6 Months Ended
	Jul. 12, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($) derivative_instrument	Dec. 31, 2020 USD ($)
Variable Interest Entity [Line Items]
Investment in unconsolidated entities		$ 104,892,000		$ 109,051,000
Interest Rate Swap
Variable Interest Entity [Line Items]
Derivative liability		67,000
IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Gain on sale			$ 1,741,000
Deferred gain on sale of property			$ 958,000
Equity investment basis adjustment, amortization period (in years)			30 years
Repayment of mortgage note payable on one retail property		23,150,000	$ 14,872,000
IAGM Retail Fund I, LLC | Interest Rate Swap
Variable Interest Entity [Line Items]
Number of derivatives held | derivative_instrument			2
Derivative liability		123,000
IAGM Retail Fund I, LLC | Interest Rate Swap, Effective Date April 1, 2020, 1.979% Fixed Interest
Variable Interest Entity [Line Items]
Notional amount			$ 45,000,000
Fixed interest rate			1.979%
IAGM Retail Fund I, LLC | Interest Rate Swap, Effective Date April 1, 2020, 1.956% Fixed Interest
Variable Interest Entity [Line Items]
Notional amount			$ 30,000,000
Fixed interest rate			1.956%
IAGM Retail Fund I, LLC | Subsequent Event
Variable Interest Entity [Line Items]
Repayment of mortgage note payable on one retail property	$ 54,103,000
Antoine Town Center
Variable Interest Entity [Line Items]
Deferred gain on sale of property		$ 54,000
Retail
Variable Interest Entity [Line Items]
Purchase price			$ 33,204,000
Retail | Antoine Town Center
Variable Interest Entity [Line Items]
Purchase price			$ 22,254,000
Retail | Prestonwood Town Center | Subsequent Event
Variable Interest Entity [Line Items]
Purchase price	$ 52,800,000
IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Ownership percentage		55.00%		55.00%
Investment in unconsolidated entities		$ 104,892,000		$ 109,051,000

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