ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ACCOUNTS PAYABLE AND ACCRUED EXPENSES.
Accounts payable	$ 6,703	$ 8,271
Accrued general and administrative expenses	5,618	5,745
Accrued vessel operating expenses	10,564	13,451
Total	$ 22,885	$ 27,467