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REAL ESTATE INVESTMENTS - Acquired intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
REAL ESTATE INVESTMENTS |  |  |
Accumulated amortization, Intangible Lease Liabilities | $ 5,191 | $ 5,061 |
Amortization of acquired intangible lease assets/liabilities | 952 | 831 | $ 785
Rental income, net |  |  |
REAL ESTATE INVESTMENTS |  |  |
Amortization of acquired intangible lease assets/liabilities | 952 | 831 | 785
Depreciation and amortization |  |  |
REAL ESTATE INVESTMENTS |  |  |
Amortization of tenant origination costs | 4,821 | 4,722 | $ 4,700
Interest expense |  |  |
REAL ESTATE INVESTMENTS |  |  |
Amortization of intangible mortgage assets | 114 | 12 |
Lease Intangible |  |  |
REAL ESTATE INVESTMENTS |  |  |
Accumulated amortization, Intangible Assets | 19,377 | 23,506 |
Intangible Mortgage Assets |  |  |
REAL ESTATE INVESTMENTS |  |  |
Accumulated amortization, Intangible Assets | $ 126 | $ 12 |

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