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ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
ACCOUNTS PAYABLE AND ACCRUED EXPENSES.    
Accounts payable $ 13,344 $ 15,110
Accrued general and administrative expenses 2,445 4,298
Accrued vessel operating expenses 17,362 9,735
Total accounts payable and accrued expenses $ 33,151 $ 29,143