INCOME PROPERTIES - Dispositions (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($) property item	Jun. 30, 2021 USD ($) property tenant	Dec. 31, 2021 USD ($)
Dispositions of Income Properties
Carrying Value	$ 68,783		$ 39,095
2022 Dispositions, Income Properties
Dispositions of Income Properties
Number of real estate properties | property	2
2022 Dispositions, Income Properties | Income Property, Single-tenant, Outback, Austin, Texas
Dispositions of Income Properties
Number Of Tenant Repurchase Options | item	2
Carrying Value	$ 16,250
2022 Dispositions, Income Properties, Single-tenant | Income Property, Party City Corporation, Oceanside, New York
Dispositions of Income Properties
Sales price	6,900
Gain (Loss) on Sale	$ (60)
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income	Gain (Loss) on Disposition of Assets
2022 Dispositions, Income Properties, Single-tenant | Income Property, Single-tenant, Outback, Austin, Texas
Dispositions of Income Properties
Sales price	$ 17,100
Gain (Loss) on Sale	$ (200)
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income	Gain (Loss) on Disposition of Assets
2021 Dispositions, Single-tenant
Dispositions of Income Properties
Number Of Tenant Repurchase Options | tenant		1
2021 Dispositions, Single-tenant | Income Property, Burlington Coat Stores, Inc, North Richland Hills, Texas
Dispositions of Income Properties
Sales price		$ 11,500
Gain (Loss) on Sale		$ 100
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income		Gain (Loss) on Disposition of Assets
2021 Dispositions, Single-tenant | Income Property, Staples, Sarasota, Florida
Dispositions of Income Properties
Sales price		$ 4,700
Gain (Loss) on Sale		$ 700
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income		Gain (Loss) on Disposition of Assets
2021 Dispositions, Single-tenant | Income Properties, Single-tenant, CMBS Portfolio
Dispositions of Income Properties
Sales price		$ 44,500
Gain (Loss) on Sale		$ 3,900
Number of real estate properties | property		6
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income		Gain (Loss) on Disposition of Assets
2020 Dispositions, Single-tenant
Dispositions of Income Properties
Number Of Tenant Repurchase Options | tenant		9
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 2022 Dispositions, Income Properties
Dispositions of Income Properties
Sales price	$ 24,000
Gain (Loss) on Sale	$ (200)
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income	Gain (Loss) on Disposition of Assets
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 2021 Dispositions, Income Properties
Dispositions of Income Properties
Sales price		$ 65,500
Gain (Loss) on Sale		$ 5,300
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income		Gain (Loss) on Disposition of Assets
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 2021 Dispositions, Multi-tenant | Income Property, World of Beer, Fuzzys Taco Shop, Brandon, Florida
Dispositions of Income Properties
Sales price		$ 2,300
Gain (Loss) on Sale		$ 600
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income		Gain (Loss) on Disposition of Assets
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 2021 Dispositions, Single-tenant | Income Property, Single-tenant, Moe's Southwest Grill, Jacksonville, Florida
Dispositions of Income Properties
Sales price		$ 2,500
Gain (Loss) on Sale		$ 100
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income		Gain (Loss) on Disposition of Assets