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LEASES - Rental Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]        
Total rental income recognized $ 521 $ 534 $ 1,041 $ 1,067