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ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
ACCOUNTS PAYABLE AND ACCRUED EXPENSES.    
Accounts payable $ 11,862 $ 11,864
Accrued general and administrative expenses 4,232 3,258
Accrued vessel operating expenses 8,044 7,671
Total accounts payable and accrued expenses $ 24,138 $ 22,793