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OPERATING LEASES - Narrative (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
USD ($)
very_large_crude_carrier
Jun. 30, 2020
USD ($)
Lessee, Lease, Description [Line Items]    
Number of redelivered vessels | very_large_crude_carrier 2  
Lease expense $ 4,661 $ 12,976
Payments for operating leases $ 3,500 $ 5,700
Operating lease, weighted average discount rate 3.30% 3.80%
Operating lease, weighted average remaining lease term 4 years 3 years
Property Subject to Operating Lease    
Lessee, Lease, Description [Line Items]    
Lease expense $ 3,500 $ 5,800
Ship operating expense    
Lessee, Lease, Description [Line Items]    
Lease expense 1,700 3,300
Charter hire expense    
Lessee, Lease, Description [Line Items]    
Lease expense 2,600 4,500
Administrative expense    
Lessee, Lease, Description [Line Items]    
Lease expense $ 900 $ 1,200