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LEASES - Rental Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Total rental income recognized $ 524 $ 492 $ 1,565 $ 1,559