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ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
ACCOUNTS PAYABLE AND ACCRUED EXPENSES.    
Accounts payable $ 12,802 $ 15,110
Accrued general and administrative expenses 1,434 4,298
Accrued vessel operating expenses 9,901 9,735
Total accounts payable and accrued expenses $ 24,137 $ 29,143