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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES        
Percentage of gross shipping income attributable to transportation beginning or ending in the U.S. will be subject to a 4% tax without allowance for deductions     50.00%  
Percentage of tax without allowance for deductions on gross shipping income attributable to transportation beginning or ending in the U.S.     4.00%  
Gross transportation tax $ 167 $ 61 $ 380 $ 97