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VARIABLE INTEREST ENTITIES (VIEs) (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 16, 2021
Sep. 30, 2021
USD ($)
item
Sep. 30, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Nov. 30, 2016
property
Oct. 31, 2016
property
Sep. 30, 2014
building
property
Variable Interest Entity [Line Items]              
Number of commercial pools   1 1        
Number of joint ventures   2 2        
Accounts receivable, net, current | $   $ 96,858 $ 96,858 $ 43,362      
DASM [Member]              
Variable Interest Entity [Line Items]              
Variable interest entity percentage of ownership 51.00%            
DASM [Member] | A E Holdings [Member              
Variable Interest Entity [Line Items]              
Variable interest entity percentage of ownership 49.00%            
NT Suez [Member]              
Variable Interest Entity [Line Items]              
Number of buildings purchase | building             2
Number of vessels | property         2 2 2
Number of vessels owned | property             1
Variable interest entity percentage of ownership 51.00%            
NT Suez [Member] | WLR/TRF[Member]              
Variable Interest Entity [Line Items]              
Variable interest entity percentage of ownership 49.00%            
Variable Interest Entity, Not Primary Beneficiary [Member] | FSO Joint Venture [Member]              
Variable Interest Entity [Line Items]              
Accounts receivable, net, current | $   $ 16,600 $ 16,600        
Variable Interest Entity, Primary Beneficiary [Member]              
Variable Interest Entity [Line Items]              
Variable interest entity percentage of ownership   51.00%          
Number of joint ventures   2 2        
Variable Interest Entity, Primary Beneficiary [Member] | DASM and NT Suez [Member]              
Variable Interest Entity [Line Items]              
Variable interest entity percentage of ownership 51.00%            
Variable Interest Entity, Primary Beneficiary [Member] | NT Suez [Member]              
Variable Interest Entity [Line Items]              
Variable interest entity percentage of ownership     51.00%