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Lease obligations - Extension options (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Finance Leases [Line Items]    
Lease liabilities recognized (discounted) $ 717,101  
Potential future lease payments not included in lease liabilities (undiscounted) 52,552 $ 53,400
Ocean-going vessels    
Disclosure of Finance Leases [Line Items]    
Lease liabilities recognized (discounted) 494,133  
Potential future lease payments not included in lease liabilities (undiscounted) 3,762  
Terminals and tanks    
Disclosure of Finance Leases [Line Items]    
Lease liabilities recognized (discounted) 175,533  
Potential future lease payments not included in lease liabilities (undiscounted) 32,308  
Other    
Disclosure of Finance Leases [Line Items]    
Lease liabilities recognized (discounted) 47,435  
Potential future lease payments not included in lease liabilities (undiscounted) $ 16,482