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FAIR VALUE OF FINANCIAL INSTRUMENTS - NONRECURRING (Details) - Fair Value, Measurements, Nonrecurring
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
item
Mar. 31, 2021
USD ($)
item
Dec. 31, 2021
USD ($)
Fair value of financial instruments      
Number of vessels written down as part of impairment | item 0 0  
Impairment of operating lease right of use asset $ 0 $ 0  
Level 3      
Fair value of financial instruments      
Financial assets 0   $ 0
Financial liabilities $ 0   $ 0