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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
PREPAID EXPENSES AND OTHER CURRENT ASSETS.    
Vessel Stores $ 629 $ 597
Capitalized contract costs 748 2,289
Prepaid items 4,590 3,426
Insurance receivable 1,239 851
Advance to agents 1,063 1,109
Other 944 2,177
Total prepaid expenses and other current assets $ 9,213 $ 10,449