INCOME PROPERTIES - Acquisitions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) ft² property item	Dec. 31, 2020 USD ($) ft² property	Dec. 31, 2019 USD ($) property	Nov. 03, 2020 USD ($)
Acquisitions of Income Properties
Weighted average amortization period of intangible assets	7 years 9 months 18 days
Aggregate outstanding principal balance				$ 2,000
Income Property, Multi-tenant, Crossroads Towne Center, Chandler, Arizona
Acquisitions of Income Properties
Date of Acquisition	Jan. 24, 2020
Income Property, Multi-tenant, Ashford Lane, Atlanta, Georgia
Acquisitions of Income Properties
Date of Acquisition	Feb. 21, 2020
Income Property, Single-tenant, Ford Motor Credit, Tampa, Florida
Acquisitions of Income Properties
Date of Acquisition	Aug. 21, 2020
2021 Acquisitions
Acquisitions of Income Properties
Number of real estate properties | property	8
Aggregate acquisition cost including capitalized acquisition costs	$ 249,800
Weighted average amortization period of intangible assets	6 years 9 months 18 days
Property Square-Feet | ft²	1,111,491
Purchase Price	$ 249,050
Remaining Lease Term at Acquisition Date (in years)	6 years 6 months
2021 Acquisitions | Nonrecurring basis
Acquisitions of Income Properties
Land	$ 78,000
Buildings and improvements	124,900
Intangible assets pertaining to the in-place lease value, leasing fees and above market lease value	49,700
Intangible liabilities for below market lease value	$ 2,800
2021 Acquisitions | Income Property, Multi-tenant, Jordan Landing, West Jordan, Utah
Acquisitions of Income Properties
Date of Acquisition	Mar. 02, 2021
Property Square-Feet | ft²	170,996
Purchase Price	$ 20,000
Percentage Leased at Acquisition	100.00%
Remaining Lease Term at Acquisition Date (in years)	7 years 10 months 24 days
2021 Acquisitions | Income Property, Multi-tenant, Eastern Commons, Henderson, Nevada
Acquisitions of Income Properties
Date of Acquisition	Mar. 10, 2021
Property Square-Feet | ft²	133,304
Purchase Price	$ 18,500
Percentage Leased at Acquisition	96.00%
Remaining Lease Term at Acquisition Date (in years)	6 years 10 months 24 days
2021 Acquisitions | Income Property, Multi-tenant, Shops at Legacy, Plano, Texas
Acquisitions of Income Properties
Date of Acquisition	Jun. 23, 2021
Property Square-Feet | ft²	236,867
Purchase Price	$ 72,500
Percentage Leased at Acquisition	83.00%
Remaining Lease Term at Acquisition Date (in years)	6 years 10 months 24 days
2021 Acquisitions | Income Property, Multi Tenant, Beaver Creek, Apex, North Carolina
Acquisitions of Income Properties
Date of Acquisition	Dec. 02, 2021
Property Square-Feet | ft²	320,732
Purchase Price	$ 70,500
Percentage Leased at Acquisition	97.00%
Remaining Lease Term at Acquisition Date (in years)	5 years 9 months 18 days
2021 Acquisitions | Income Property, Multi Tenant ,125 Lincoln & 150 Washington ,Santa Fe, New Mexico
Acquisitions of Income Properties
Date of Acquisition	Dec. 20, 2021
Property Square-Feet | ft²	136,638
Purchase Price	$ 16,250
Percentage Leased at Acquisition	66.00%
Remaining Lease Term at Acquisition Date (in years)	2 years 8 months 12 days
2021 Acquisitions | Income Property, Multi Tenant, Synovus ,Winter Park ,Florida
Acquisitions of Income Properties
Date of Acquisition	Dec. 20, 2021
Property Square-Feet | ft²	28,008
Purchase Price	$ 13,200
Percentage Leased at Acquisition	100.00%
Remaining Lease Term at Acquisition Date (in years)	5 years
2021 Acquisitions | Income Property, Multi Tenant ,Exchange at Gwinnett ,Buford ,Georgia
Acquisitions of Income Properties
Date of Acquisition	Dec. 30, 2021
Property Square-Feet | ft²	69,265
Purchase Price	$ 34,000
Percentage Leased at Acquisition	98.00%
Remaining Lease Term at Acquisition Date (in years)	10 years 8 months 12 days
2021 Acquisitions | Income Property, Two Tenant, Ashford Lane Outparcel, Atlanta, Georgia
Acquisitions of Income Properties
Date of Acquisition	Dec. 30, 2021
Property Square-Feet | ft²	15,681
Purchase Price	$ 4,100
Percentage Leased at Acquisition	19.00%
Remaining Lease Term at Acquisition Date (in years)	10 months 24 days
2020 Acquisitions
Acquisitions of Income Properties
Aggregate acquisition cost including capitalized acquisition costs		$ 185,700
Weighted average amortization period of intangible assets		4 years 6 months
Property Square-Feet | ft²		751,210
Purchase Price		$ 185,135
Remaining Lease Term at Acquisition Date (in years)		6 years 6 months
2020 Acquisitions | Commercial loan and master lease investments
Acquisitions of Income Properties
Purchase Price		$ 21,000
2020 Acquisitions | Nonrecurring basis
Acquisitions of Income Properties
Land		50,000
Buildings and improvements		94,600
Intangible assets pertaining to the in-place lease value, leasing fees and above market lease value		21,900
Intangible liabilities for below market lease value		$ 1,800
2020 Acquisitions | Income Property, Multi-tenant, Crossroads Towne Center, Chandler, Arizona
Acquisitions of Income Properties
Date of Acquisition		Jan. 24, 2020
Property Square-Feet | ft²		254,109
Purchase Price		$ 61,800
Percentage Leased at Acquisition		99.00%
Remaining Lease Term at Acquisition Date (in years)		5 years
2020 Acquisitions | Income Property, Multi-tenant, Ashford Lane, Atlanta, Georgia
Acquisitions of Income Properties
Date of Acquisition		Feb. 21, 2020
Property Square-Feet | ft²		268,572
Purchase Price		$ 75,435
Percentage Leased at Acquisition		80.00%
Remaining Lease Term at Acquisition Date (in years)		3 years 7 months 6 days
2020 Acquisitions | Income Property, Single-tenant, Ford Motor Credit, Tampa, Florida
Acquisitions of Income Properties
Date of Acquisition		Aug. 21, 2020
Property Square-Feet | ft²		120,500
Purchase Price		$ 26,900
Percentage Leased at Acquisition		100.00%
Remaining Lease Term at Acquisition Date (in years)		5 years 7 months 6 days
2020 Acquisitions | Income Property, Single-tenant, Master Tenant, Hialeah, Florida
Acquisitions of Income Properties
Date of Acquisition		Sep. 25, 2020
Property Square-Feet | ft²		108,029
Purchase Price		$ 21,000
Percentage Leased at Acquisition		100.00%
Remaining Lease Term at Acquisition Date (in years)		25 years
Number Of Tenant Repurchase Options | item	3
2020 Acquisitions | Income Property, Single-tenant, Master Tenant, Hialeah, Florida | Commercial loan and master lease investments
Acquisitions of Income Properties
Aggregate outstanding principal balance	$ 21,000
2020 Acquisitions, Multi-tenant
Acquisitions of Income Properties
Number of real estate properties | property		2
2020 Acquisitions, Single-tenant
Acquisitions of Income Properties
Number of real estate properties | property		2
2019 Acquisitions
Acquisitions of Income Properties
Aggregate acquisition cost including capitalized acquisition costs			$ 165,700
Weighted average amortization period of intangible assets			9 years 8 months 12 days
Purchase Price			$ 164,700
2019 Acquisitions | Nonrecurring basis
Acquisitions of Income Properties
Land			45,600
Buildings and improvements			83,500
Intangible assets pertaining to the in-place lease value, leasing fees and above market lease value			23,400
Intangible liabilities for below market lease value			$ 3,100
2019 Acquisitions, Multi-tenant
Acquisitions of Income Properties
Number of real estate properties | property			1
2019 Acquisitions, Single-tenant
Acquisitions of Income Properties
Number of real estate properties | property			10