PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
PREPAID EXPENSES AND OTHER CURRENT ASSETS
Vessel stores	$ 566	$ 638
Capitalized contract costs	2,516	1,952
Prepaid items	2,871	2,870
Insurance receivable	2,217	2,039
Advance to agents	1,218	1,162
Other	1,477	1,388
Total prepaid expenses and other current assets	$ 10,865	$ 10,049