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SALES OF PROPERTIES (Details) - USD ($) $ in Thousands					3 Months Ended			9 Months Ended
	Jul. 01, 2021	Jun. 17, 2021	Jul. 01, 2020	Feb. 11, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
SALES OF PROPERTIES
Mortgage Prepaid on Sale								$ 26,630	$ 11,815
Prepayment costs on debt					$ (38)	$ (58)		(837)	(1,123)
Properties disposed of by sale
SALES OF PROPERTIES
Gross Sales Price								48,810	25,115
Gain on Sale of Real Estate, Net								22,768	14,568
Mortgage Prepaid on Sale								18,977	11,815
Prepayment costs on debt								$ 825	$ 1,123
Properties disposed of by sale | Whole Foods retail property & parking lot, West Hartford, Connecticut
SALES OF PROPERTIES
Gross Sales Price		$ 40,510
Gain on Sale of Real Estate, Net		21,469
Mortgage Prepaid on Sale		15,403
Prepayment costs on debt		799
Write-off of unbilled rent receivable, as a reduction to Gain on sale of real estate, net		1,148
Write-off of the unamortized intangible lease liability		$ 967
Properties disposed of by sale | Vacant retail property, Philadelphia, Pennsylvania
SALES OF PROPERTIES
Gross Sales Price	$ 8,300
Gain on Sale of Real Estate, Net	1,299
Mortgage Prepaid on Sale	3,574
Prepayment costs on debt	$ 26
Ownership interest in consolidated joint venture of the company (as a percent)	90.00%
Noncontrolling interest share of gain	$ 130
Properties disposed of by sale | Hobby Lobby retail property, Onalaska, Wisconsin
SALES OF PROPERTIES
Gross Sales Price				$ 7,115
Gain on Sale of Real Estate, Net				4,252
Mortgage Prepaid on Sale				3,332
Prepayment costs on debt				290
Write-off of unbilled rent receivable, as a reduction to Gain on sale of real estate, net				$ 170
Properties disposed of by sale | CarMax retail property, Knoxville, Tennessee
SALES OF PROPERTIES
Gross Sales Price			$ 18,000
Gain on Sale of Real Estate, Net			10,316
Mortgage Prepaid on Sale			8,483
Prepayment costs on debt			833			$ 58	$ 775
Write-off of unbilled rent receivable, as a reduction to Gain on sale of real estate, net			$ 122
Consolidated Joint Venture-VIEs
SALES OF PROPERTIES
Ownership interest in consolidated joint venture of the company (as a percent)					90.00%			90.00%

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