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VESSELS AND EQUIPMENT UNDER FINANCE LEASE, NET - Narrative (Details) - vessels
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Leases [Abstract]    
Finance lease, number of leased assets 2 2
Finance lease, remaining lease term 6 years 6 years
Weighted average discount rate (percent) 7.50%