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ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
ACCOUNTS PAYABLE AND ACCRUED EXPENSES.    
Accounts payable $ 9,863 $ 6,703
Accrued general and administrative expenses 2,978 5,618
Accrued vessel operating expenses 10,389 10,564
Total accounts payable and accrued expenses $ 23,230 $ 22,885