REVENUE RECOGNITION - Major Good or Service (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Revenues
Lease revenue	$ 11,449	$ 11,003
Revenue from contract with customer, including assessed tax	1,893	81
Commercial Loan Investments	701	1,052
Total Revenues	14,712	12,838
Lease Revenue - Base Rent
Revenues
Lease revenue	9,181	8,751
Lease Revenue - CAM
Revenues
Lease revenue	512	784
Lease Revenue - Reimbursements
Revenues
Lease revenue	1,206	790
Lease Revenue - Billboards
Revenues
Lease revenue		44
Above / Below Market Lease Accretion
Revenues
Lease revenue	396	474
Contributed Leased Assets Accretion
Revenues
Lease revenue	121	43
Management Services
Revenues
Revenue from contract with customer, including assessed tax	669	702
Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax		4
Subsurface Revenue
Revenues
Revenue from contract with customer, including assessed tax	1,893	77
Interest and Other Revenue
Revenues
Interest and Other Revenue	33	117
Income Properties
Revenues
Total Revenues	11,449	11,003
Income Properties \| Lease Revenue - Base Rent
Revenues
Lease revenue	9,181	8,751
Income Properties \| Lease Revenue - CAM
Revenues
Lease revenue	512	784
Income Properties \| Lease Revenue - Reimbursements
Revenues
Lease revenue	1,206	790
Income Properties \| Lease Revenue - Billboards
Revenues
Lease revenue		44
Income Properties \| Above / Below Market Lease Accretion
Revenues
Lease revenue	396	474
Income Properties \| Contributed Leased Assets Accretion
Revenues
Lease revenue	121	43
Income Properties \| Interest and Other Revenue
Revenues
Interest and Other Revenue	33	117
Management Fee Income
Revenues
Total Revenues	669	702
Management Fee Income \| Management Services
Revenues
Revenue from contract with customer, including assessed tax	669	702
Interest Income from Commercial Loan and Master Lease Investments
Revenues
Commercial Loan Investments	701	1,052
Total Revenues	701	1,052
Real Estate Operations
Revenues
Total Revenues	1,893	81
Real Estate Operations \| Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax		4
Real Estate Operations \| Subsurface Revenue
Revenues
Revenue from contract with customer, including assessed tax	$ 1,893	$ 77

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