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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Voyage expense recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Voyage expense recognition        
Net (gain) loss on purchase and sale of bunker fuel and net realizable value adjustments $ (443) $ 958 $ (937) $ 1,800