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REAL ESTATE INVESTMENTS - Depreciation and Amortization (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Depreciation and Amortization      
Depreciation expense $ 24,789,000 $ 23,781,000 $ 22,832,000
Buildings      
Depreciation and Amortization      
Estimated useful life 40 years