XML 65 R66.htm IDEA: XBRL DOCUMENT v3.20.1
Property, plant and equipment - Owned Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in property, plant and equipment [abstract]    
Value at beginning of period $ 2,857,266  
Value at end of period 2,940,777 $ 2,857,266
Buildings, plant installations and machinery    
Reconciliation of changes in property, plant and equipment [abstract]    
Value at beginning of period 2,650,407  
Value at end of period 2,572,455 2,650,407
Plants under construction    
Reconciliation of changes in property, plant and equipment [abstract]    
Value at beginning of period 0  
Value at end of period 155,871 0
Ocean going vessels    
Reconciliation of changes in property, plant and equipment [abstract]    
Value at beginning of period 134,993  
Value at end of period 176,499 134,993
Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Value at beginning of period 71,866  
Value at end of period 35,952 71,866
Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Value at beginning of period 5,070,619 4,924,417
Additions 330,636 279,070
Disposals and other (101,454) (132,868)
Transfers 0  
Value at end of period 5,299,801 5,070,619
Cost | Buildings, plant installations and machinery    
Reconciliation of changes in property, plant and equipment [abstract]    
Value at beginning of period 4,698,142 4,648,924
Additions 150,570 180,437
Disposals and other (61,197) (131,219)
Transfers 0  
Value at end of period 4,787,515 4,698,142
Cost | Plants under construction    
Reconciliation of changes in property, plant and equipment [abstract]    
Value at beginning of period 0 0
Additions 118,249 0
Disposals and other 0 0
Transfers 37,622  
Value at end of period 155,871 0
Cost | Ocean going vessels    
Reconciliation of changes in property, plant and equipment [abstract]    
Value at beginning of period 183,419 144,423
Additions 57,479 40,284
Disposals and other (38,951) (1,288)
Transfers 0  
Value at end of period 201,947 183,419
Cost | Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Value at beginning of period 189,058 131,070
Additions 4,338 58,349
Disposals and other (1,306) (361)
Transfers (37,622)  
Value at end of period 154,468 189,058
Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Value at beginning of period (2,213,353)  
Disposals and other (96,386) (126,474)
Depreciation 242,057 231,890
Value at end of period (2,359,024) (2,213,353)
Accumulated depreciation | Buildings, plant installations and machinery    
Reconciliation of changes in property, plant and equipment [abstract]    
Value at beginning of period (2,047,735)  
Disposals and other (63,169) (124,920)
Depreciation 230,494 216,338
Value at end of period (2,215,060) (2,047,735)
Accumulated depreciation | Plants under construction    
Reconciliation of changes in property, plant and equipment [abstract]    
Value at beginning of period 0  
Disposals and other 0 0
Depreciation 0 0
Value at end of period 0 0
Accumulated depreciation | Ocean going vessels    
Reconciliation of changes in property, plant and equipment [abstract]    
Value at beginning of period (48,426)  
Disposals and other (31,620) (1,194)
Depreciation 8,642 9,193
Value at end of period (25,448) (48,426)
Accumulated depreciation | Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Value at beginning of period (117,192)  
Disposals and other (1,597) (360)
Depreciation 2,921 6,359
Value at end of period $ (118,516) $ (117,192)