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REAL ESTATE INVESTMENTS - Acquired intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
REAL ESTATE INVESTMENTS |  |  |
Intangible Lease Liabilities, weighted average amortization (years) | 8 years 9 months 18 days | 8 years 2 months 12 days |
Intangible Lease Liabilities, accumulated amortization | $ 5,061 | $ 8,968 |
Amortization of intangibles relating to leases, net | 831 | 785 | $ 780
Rental income, net |  |  |
REAL ESTATE INVESTMENTS |  |  |
Amortization of intangibles relating to leases, net | 831 | 785 | 780
Depreciation and amortization |  |  |
REAL ESTATE INVESTMENTS |  |  |
Amortization of origination costs | 4,722 | $ 4,700 | $ 4,617
Interest expense |  |  |
REAL ESTATE INVESTMENTS |  |  |
Amortization of intangible mortgage assets | $ 12 |  |
Lease Intangible |  |  |
REAL ESTATE INVESTMENTS |  |  |
Intangible Assets, weighted average amortization (years) | 6 years 1 month 6 days | 4 years 1 month 6 days |
Intangible Assets, accumulated amortization | $ 23,506 | $ 25,892 |
Mortgage Intangible |  |  |
REAL ESTATE INVESTMENTS |  |  |
Intangible Assets, weighted average amortization (years) | 7 years 1 month 6 days |  |
Intangible Assets, accumulated amortization | $ 12 |  |

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