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Investment in Unconsolidated Entities - Narrative (Details)	9 Months Ended
	Sep. 30, 2021 USD ($) ft²	Sep. 30, 2020 USD ($) ft² swap	Dec. 31, 2020 USD ($)
Variable Interest Entity [Line Items]
Investment in unconsolidated entities	$ 104,963,000		$ 109,051,000
Proceeds from sale of investment properties, net	14,797,000	$ 5,791,000
Prepaid mortgages payable	0	2,504,000
Interest Rate Swap
Variable Interest Entity [Line Items]
Derivative liability	53,000
IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Gain on sale	12,428,000	1,741,000
Deferred gain on sale of property	$ 6,835,000	$ 958,000
Equity investment basis adjustment, amortization period (in years)	30 years	30 years
Prepaid mortgages payable	$ 23,150,000	$ 14,872,000
Repayment of mortgage note payable on one retail property	54,103,000
IAGM Retail Fund I, LLC | Interest Rate Swap
Variable Interest Entity [Line Items]
Number of derivatives held | swap		2
Derivative liability	97,000
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%
Antoine Town Center
Variable Interest Entity [Line Items]
Deferred gain on sale of property	54,000
Retail
Variable Interest Entity [Line Items]
Purchase price	$ 54,710,000	$ 33,204,000
Gross leasable area (square feet) | ft²	240,000	174,000
Retail | Westover Marketplace
Variable Interest Entity [Line Items]
Deferred gain on sale of property	$ 219,000
Retail | Westover Marketplace | IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Gain on sale	$ 399,000
Gross leasable area (square feet) | ft²	243,000
Proceeds from sale of investment properties, net	$ 28,775,000
Retail | Antoine Town Center
Variable Interest Entity [Line Items]
Purchase price		$ 22,254,000
Gross leasable area (square feet) | ft²		111,000
Retail | Prestonwood Town Center
Variable Interest Entity [Line Items]
Purchase price	$ 52,800,000
Gross leasable area (square feet) | ft²	233,000
IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Ownership percentage	55.00%		55.00%
Investment in unconsolidated entities	$ 104,963,000		$ 109,051,000

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