INCOME PROPERTIES AND LEASES - 2021 and 2020 Acquisitions (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) ft² property	Mar. 31, 2020 USD ($) ft² property
Acquisitions of Income Properties
Weighted average amortization period of intangible assets	8 years 6 months
Property Square-Feet | ft²	329,987	522,681
Purchase Price	$ 38,500	$ 137,235
Remaining Lease Term at Acquisition Date (in years)	7 years 4 months 24 days	4 years 2 months 12 days
2021 Acquisitions
Acquisitions of Income Properties
Aggregate acquisition cost including capitalized acquisition costs	$ 38,600
Weighted average amortization period of intangible assets	7 years 7 months 6 days
Purchase Price	$ 38,500
2021 Acquisitions | Nonrecurring basis
Acquisitions of Income Properties
Land	18,400
Buildings and improvements	14,300
Intangible liabilities for below market lease value	$ 5,900
2021 Acquisitions | Multi-tenant
Acquisitions of Income Properties
Number of real estate properties | property	2
2020 Acquisitions
Acquisitions of Income Properties
Aggregate acquisition cost including capitalized acquisition costs		$ 137,700
Purchase Price		137,200
2020 Acquisitions | Nonrecurring basis
Acquisitions of Income Properties
Land		46,700
Buildings and improvements		74,000
Intangible assets pertaining to the in-place lease value, leasing fees and above market lease value		18,800
Intangible liabilities for below market lease value		$ 1,800
2020 Acquisitions | Multi-tenant
Acquisitions of Income Properties
Number of real estate properties | property		2
Jordan Landing
Acquisitions of Income Properties
Property Square-Feet | ft²	183,320
Purchase Price	$ 20,000
Percentage Leased at Acquisition	93.00%
Remaining Lease Term at Acquisition Date (in years)	7 years 10 months 24 days
Eastern Commons
Acquisitions of Income Properties
Property Square-Feet | ft²	146,667
Purchase Price	$ 18,500
Percentage Leased at Acquisition	88.00%
Remaining Lease Term at Acquisition Date (in years)	6 years 10 months 24 days
Crossroads Towne Center
Acquisitions of Income Properties
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
Ashford Lane
Acquisitions of Income Properties
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