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LEASES - As Lessor - Unbilled Straight-Line Rent (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Unbilled Straight-Line Rent      
Unbilled rent receivable $ 16,661,000 $ 16,079,000  
Period during which amount of unbilled rent receivable is to be billed and received 19 years    
Unbilled straight-line rent receivables written off related to property sold $ 1,048,000 519,000 $ 1,438,000
Unearned rental income $ 579,000 756,000  
Period during which amount of unbilled rent payable is to be billed and received 8 years    
Unbilled rent receivable written off during the period due to the sale of property $ 43,000 $ 0 $ 0
Unbilled rent straight-line rent receivable written off related to tenant bankruptcy $ 133,000