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OPERATING REVENUES - Contract Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Capitalized Contract Cost [Line Items]    
Contract assets $ 82,192 $ 62,958
Voyages in progress    
Capitalized Contract Cost [Line Items]    
Contract assets 26,601 27,621
Trade accounts receivable    
Capitalized Contract Cost [Line Items]    
Contract assets 42,745 25,615
Related party receivables    
Capitalized Contract Cost [Line Items]    
Contract assets 9,509 7,195
Other current assets    
Capitalized Contract Cost [Line Items]    
Contract assets $ 3,337 $ 2,527