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Property, plant and equipment - Right of use assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Changes in Right of Use Assets [Roll Forward]    
Right-of-use assets, beginning balance $ 635,418  
Right-of-use assets, ending balance 624,996 $ 635,418
Cost    
Reconciliation of Changes in Right of Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 798,097 628,479
Additions 114,005 171,992
Disposals and other (20,046) (2,374)
Right-of-use assets, ending balance 892,056 798,097
Accumulated depreciation    
Reconciliation of Changes in Right of Use Assets [Roll Forward]    
Right-of-use assets, beginning balance (162,679) (49,981)
Disposals and other 14,026 0
Depreciation 118,407 112,698
Right-of-use assets, ending balance (267,060) (162,679)
Ocean going vessels    
Reconciliation of Changes in Right of Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 425,018  
Right-of-use assets, ending balance 429,456 425,018
Ocean going vessels | Cost    
Reconciliation of Changes in Right of Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 514,661 370,654
Additions 86,214 144,764
Disposals and other (18,803) (757)
Right-of-use assets, ending balance 582,072 514,661
Ocean going vessels | Accumulated depreciation    
Reconciliation of Changes in Right of Use Assets [Roll Forward]    
Right-of-use assets, beginning balance (89,643) (15,204)
Disposals and other 13,727 0
Depreciation 76,700 74,439
Right-of-use assets, ending balance (152,616) (89,643)
Terminals and tanks    
Reconciliation of Changes in Right of Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 162,063  
Right-of-use assets, ending balance 154,719 162,063
Terminals and tanks | Cost    
Reconciliation of Changes in Right of Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 221,303 207,721
Additions 25,758 13,582
Disposals and other (508) 0
Right-of-use assets, ending balance 246,553 221,303
Terminals and tanks | Accumulated depreciation    
Reconciliation of Changes in Right of Use Assets [Roll Forward]    
Right-of-use assets, beginning balance (59,240) (29,333)
Disposals and other 0 0
Depreciation 32,594 29,907
Right-of-use assets, ending balance (91,834) (59,240)
Buildings, plant installations and machinery    
Reconciliation of Changes in Right of Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 15,746  
Right-of-use assets, ending balance 13,353 15,746
Buildings, plant installations and machinery | Cost    
Reconciliation of Changes in Right of Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 23,613 19,705
Additions 148 3,908
Disposals and other 0 0
Right-of-use assets, ending balance 23,761 23,613
Buildings, plant installations and machinery | Accumulated depreciation    
Reconciliation of Changes in Right of Use Assets [Roll Forward]    
Right-of-use assets, beginning balance (7,867) (5,444)
Disposals and other 0 0
Depreciation 2,541 2,423
Right-of-use assets, ending balance (10,408) (7,867)
Other    
Reconciliation of Changes in Right of Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 32,591  
Right-of-use assets, ending balance 27,468 32,591
Other | Cost    
Reconciliation of Changes in Right of Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 38,520 30,399
Additions 1,885 9,738
Disposals and other (735) (1,617)
Right-of-use assets, ending balance 39,670 38,520
Other | Accumulated depreciation    
Reconciliation of Changes in Right of Use Assets [Roll Forward]    
Right-of-use assets, beginning balance (5,929) 0
Disposals and other 299 0
Depreciation 6,572 5,929
Right-of-use assets, ending balance $ (12,202) $ (5,929)