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LEASES - As Lessor - Unbilled Straight-Line Rent (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Unbilled Straight-Line Rent      
Unbilled rent receivable $ 16,079,000 $ 14,330,000  
Period during which amount of unbilled rent receivable is to be billed and received 20 years    
Unbilled straight-line rent receivables written off related to property sold $ 519,000 1,438,000 $ 365,000
Unearned Rental Income $ 756,000 $ 897,000  
Period during which amount of unbilled rent payable is to be billed and received 10 years    
Unbilled rent receivable written off of amounts where collectability is less than probable     $ 1,094,000