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Property, plant and equipment (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) vessel | Dec. 31, 2016 USD ($)
Reconciliation of changes in property, plant and equipment [abstract] |  |
Value at beginning of period | $ 3,117,469 |
Value at end of period | $ 2,998,326 | $ 3,117,469
Number of finance lease vessels | vessel | 2 |
Buildings, plant installations and machinery |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Value at beginning of period | $ 2,797,276 |
Value at end of period | 2,692,607 | 2,797,276
Finance leases |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Value at beginning of period | 187,703 |
Value at end of period | 181,846 | 187,703
Other |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Value at beginning of period | 132,490 |
Value at end of period | $ 123,873 | 132,490
Ocean going vessels |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Number of finance lease vessels | vessel | 2 |
Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Value at beginning of period | $ 5,028,954 | 4,848,167
Additions | 111,448 | 197,747
Disposals and other | 212 | 16,960
Value at end of period | 5,140,190 | 5,028,954
Cost | Buildings, plant installations and machinery |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Value at beginning of period | 4,549,816 | 4,521,835
Additions | 98,780 | 35,644
Disposals and other | (328) | 7,663
Value at end of period | 4,648,924 | 4,549,816
Cost | Finance leases |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Value at beginning of period | 206,260 | 121,849
Additions | 7,667 | 87,800
Disposals and other | (1,846) | 3,389
Value at end of period | 215,773 | 206,260
Cost | Other |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Value at beginning of period | 272,878 | 204,483
Additions | 5,001 | 74,303
Disposals and other | 2,386 | 5,908
Value at end of period | 275,493 | 272,878
Accumulated depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Value at beginning of period | (1,911,485) | (1,689,385)
Disposals and other | (2,739) | (6,853)
Depreciation | 233,118 | 228,953
Value at end of period | (2,141,864) | (1,911,485)
Accumulated depreciation | Buildings, plant installations and machinery |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Value at beginning of period | (1,752,540) | (1,545,834)
Disposals and other | (2,066) | (945)
Depreciation | 205,843 | 207,651
Value at end of period | (1,956,317) | (1,752,540)
Accumulated depreciation | Finance leases |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Value at beginning of period | (18,557) | (6,853)
Disposals and other | 0 | 0
Depreciation | 15,370 | 11,704
Value at end of period | (33,927) | (18,557)
Accumulated depreciation | Other |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Value at beginning of period | (140,388) | (136,698)
Disposals and other | (673) | (5,908)
Depreciation | 11,905 | 9,598
Value at end of period | $ (151,620) | $ (140,388)

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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_75_a&doctype=Standard -URIDate 2017-03-09 + Details
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