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Chartered-in Vessels - Obligations related to Finance Leases (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Obligations relating to Finance Leases [Line Items]    
Finance lease liability $ 1,287,044 $ 1,340,922
Current obligations related to finance leases (note 5a) 73,437 71,932
Long-term obligations related to finance leases (note 5a) $ 1,213,607 $ 1,268,990