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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue and Voyage Expense (Details)
$ / item in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
item
$ / item
Voyage expense recognition      
Net (loss) gain on purchase and sale of bunker fuel and net realizable value adjustments | $ $ (829) $ 3,000 $ 2,021
Number of vessels in vessel pools 0 0  
Spot Market-Related Time Charter Agreement with Profit Sharing Element      
Voyage expense recognition      
Number of vessels under spot market-related time charters which include a profit-sharing element 0 0 6
Floor price (in dollars per unit) | $ / item     3
Allocation of excess profit sharing amount (as a percent)     50.00%