PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
PREPAID EXPENSES AND OTHER CURRENT ASSETS.
Vessel Stores	$ 669	$ 597
Capitalized contract costs	3,656	2,289
Prepaid items	2,301	3,426
Insurance receivable	1,744	851
Advance to agents	508	1,109
Other	1,118	2,177
Total prepaid expenses and other current assets	$ 9,996	$ 10,449