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NEWBUILDINGS AND VESSEL PURCHASE DEPOSITS - Narrative (Details)
$ in Thousands
 1 Months Ended 6 Months Ended
Mar. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
carrier
Jun. 30, 2020
USD ($)
Property, Plant and Equipment [Line Items]      
Total installments paid | $   $ 14,500  
Number of dual-fuel car carriers | carrier   2  
Investment in newbuilding contracts and vessel deposits | $ $ 4,300 $ 18,783 $ 0
Volkswagen Group      
Property, Plant and Equipment [Line Items]      
Number of dual-fuel car carriers | carrier   2  
Term of lease or charter   10 years