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Property, plant and equipment - Changes in property, plant and equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Changes in property, plant and equipment [abstract]    
Opening net book amount $ 802,608 $ 696,889
Exchange differences (28,486) 98,234
Additions 202,081 138,723
Reclassification from investment property (Note 13) 0 1,335
Transfers 0 0
Disposals (4,115) (4,275)
Reclassification to non-income tax credits (1,086) (1,499)
Depreciation (150,071) (126,799)
Closing net book amount 820,931 802,608
Cost    
Changes in property, plant and equipment [abstract]    
Opening net book amount 1,448,423 1,215,905
Closing net book amount 1,616,817 1,448,423
Accumulated amortization    
Changes in property, plant and equipment [abstract]    
Opening net book amount (645,815) (519,016)
Closing net book amount (795,886) (645,815)
Farmlands    
Changes in property, plant and equipment [abstract]    
Opening net book amount 109,858 114,527
Exchange differences (9,561) (6,004)
Additions 0 0
Reclassification from investment property (Note 13) 0 1,335
Transfers 0 0
Disposals 0 0
Reclassification to non-income tax credits 0 0
Depreciation 0 0
Closing net book amount 100,297 109,858
Farmlands | Cost    
Changes in property, plant and equipment [abstract]    
Opening net book amount 109,858 114,527
Closing net book amount 100,297 109,858
Farmlands | Accumulated amortization    
Changes in property, plant and equipment [abstract]    
Opening net book amount 0 0
Closing net book amount 0 0
Farmland improvements    
Changes in property, plant and equipment [abstract]    
Opening net book amount 9,640 5,141
Exchange differences (1,219) (838)
Additions 0 0
Reclassification from investment property (Note 13) 0 0
Transfers 2,711 6,856
Disposals 0 0
Reclassification to non-income tax credits 0 0
Depreciation (2,125) (1,519)
Closing net book amount 9,007 9,640
Farmland improvements | Cost    
Changes in property, plant and equipment [abstract]    
Opening net book amount 20,907 14,889
Closing net book amount 22,399 20,907
Farmland improvements | Accumulated amortization    
Changes in property, plant and equipment [abstract]    
Opening net book amount (11,267) (9,748)
Closing net book amount (13,392) (11,267)
Buildings and facilities    
Changes in property, plant and equipment [abstract]    
Opening net book amount 190,055 167,468
Exchange differences (4,473) 26,675
Additions 15,495 7,420
Reclassification from investment property (Note 13) 0 0
Transfers 12,963 6,491
Disposals (162) (1,078)
Reclassification to non-income tax credits (205) (1,233)
Depreciation (20,829) (15,688)
Closing net book amount 192,844 190,055
Buildings and facilities | Cost    
Changes in property, plant and equipment [abstract]    
Opening net book amount 305,748 267,473
Closing net book amount 329,366 305,748
Buildings and facilities | Accumulated amortization    
Changes in property, plant and equipment [abstract]    
Opening net book amount (115,693) (100,005)
Closing net book amount (136,522) (115,693)
Machinery, equipment, furniture and fittings    
Changes in property, plant and equipment [abstract]    
Opening net book amount 251,310 226,049
Exchange differences (5,853) 46,053
Additions 62,101 36,190
Reclassification from investment property (Note 13) 0 0
Transfers 11,183 6,608
Disposals (3,913) (3,125)
Reclassification to non-income tax credits (788) (227)
Depreciation (67,960) (60,238)
Closing net book amount 246,080 251,310
Machinery, equipment, furniture and fittings | Cost    
Changes in property, plant and equipment [abstract]    
Opening net book amount 633,536 548,037
Closing net book amount 696,266 633,536
Machinery, equipment, furniture and fittings | Accumulated amortization    
Changes in property, plant and equipment [abstract]    
Opening net book amount (382,226) (321,988)
Closing net book amount (450,186) (382,226)
Bearer plants    
Changes in property, plant and equipment [abstract]    
Opening net book amount 216,169 156,671
Exchange differences (4,089) 33,169
Additions 84,278 74,175
Reclassification from investment property (Note 13) 0 0
Transfers 0 0
Disposals 0 0
Reclassification to non-income tax credits 0 0
Depreciation (57,448) (47,846)
Closing net book amount 238,910 216,169
Bearer plants | Cost    
Changes in property, plant and equipment [abstract]    
Opening net book amount 341,666 234,322
Closing net book amount 421,855 341,666
Bearer plants | Accumulated amortization    
Changes in property, plant and equipment [abstract]    
Opening net book amount (125,497) (77,651)
Closing net book amount (182,945) (125,497)
Others    
Changes in property, plant and equipment [abstract]    
Opening net book amount 3,935 3,920
Exchange differences (390) 103
Additions 2,351 1,484
Reclassification from investment property (Note 13) 0 0
Transfers 11 8
Disposals (40) (72)
Reclassification to non-income tax credits 0 0
Depreciation (1,709) (1,508)
Closing net book amount 4,158 3,935
Others | Cost    
Changes in property, plant and equipment [abstract]    
Opening net book amount 15,067 13,544
Closing net book amount 16,999 15,067
Others | Accumulated amortization    
Changes in property, plant and equipment [abstract]    
Opening net book amount (11,132) (9,624)
Closing net book amount (12,841) (11,132)
Work in progress    
Changes in property, plant and equipment [abstract]    
Opening net book amount 21,641 23,113
Exchange differences (2,901) (924)
Additions 37,856 19,454
Reclassification from investment property (Note 13) 0 0
Transfers (26,868) (19,963)
Disposals 0 0
Reclassification to non-income tax credits (93) (39)
Depreciation 0 0
Closing net book amount 29,635 21,641
Work in progress | Cost    
Changes in property, plant and equipment [abstract]    
Opening net book amount 21,641 23,113
Closing net book amount 29,635 21,641
Work in progress | Accumulated amortization    
Changes in property, plant and equipment [abstract]    
Opening net book amount 0 0
Closing net book amount $ 0 $ 0