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LEASES - As Lessor - Lease Termination Fees (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Lease Termination Fee                      
Revenues $ 22,448,000 $ 20,414,000 $ 20,719,000 $ 21,155,000 $ 20,270,000 $ 19,570,000 $ 19,752,000 $ 19,534,000 $ 84,736,000 $ 79,126,000 $ 75,916,000
Tenants in lease buy-out transactions                      
Lease Termination Fee                      
Number of retail tenants in lease buy-out transactions | item                 2    
Write-off of the unamortized intangible lease liability         $ 878,000         878,000  
Write-off of unbilled rent receivable                 $ 37,000 74,000  
Rental income, net                      
Lease Termination Fee                      
Revenues                 83,786,000 78,754,000 $ 75,916,000
Rental income, net | Tenants in lease buy-out transactions                      
Lease Termination Fee                      
Revenues                   804,000  
Lease termination fees                      
Lease Termination Fee                      
Revenues                 950,000 372,000  
Lease termination fees | Tenants in lease buy-out transactions                      
Lease Termination Fee                      
Revenues                 $ 950,000 $ 372,000