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CREDIT FACILITY - Interest expense and unused line of credit fees (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
CREDIT FACILITY        
Interest expense $ 778 $ 703 $ 4,021 $ 703
Amortization of debt issuance costs 129 45 392 45
Unused line of credit fees and other 38 60 114 179
Total interest expense $ 945 $ 808 $ 4,527 $ 927