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Taxation - Movement in the deferred income tax assets and liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Changes in deferred tax liability [abstract]    
Deferred income tax liabilities, beginning balance $ 14,689  
Exchange differences (1,695) $ 10,953
Deferred income tax liabilities, ending balance 10,457 14,689
Changes in deferred tax asset [Abstract]    
Deferred income tax assets, beginning balance 38,586  
Tax charge relating to cash flow hedge (8,715) (52,282)
Exchange differences 1,695 (10,953)
Deferred income tax assets, ending balance 43,437 38,586
Deferred tax liability temporary differences    
Changes in deferred tax liability [abstract]    
Deferred income tax liabilities, beginning balance 90,429 71,927
Charged/(credited) to the statement of income 11,373 17,415
Exchange differences (4,761) 1,087
Deferred income tax liabilities, ending balance 97,041 90,429
Changes in deferred tax asset [Abstract]    
Charged/(credited) to the statement of income 11,373 17,415
Exchange differences 4,761 (1,087)
Deferred tax assets temporary differences    
Changes in deferred tax liability [abstract]    
Charged/(credited) to the statement of income 30,866 29,533
Exchange differences 6,456 (12,040)
Changes in deferred tax asset [Abstract]    
Deferred income tax assets, beginning balance 114,326 125,035
Charged/(credited) to the statement of income 30,866 29,533
Exchange differences (6,456) 12,040
Deferred income tax assets, ending balance 130,021 114,326
Provisions | Deferred tax assets temporary differences    
Changes in deferred tax liability [abstract]    
Charged/(credited) to the statement of income (705) 353
Exchange differences (757) (289)
Changes in deferred tax asset [Abstract]    
Deferred income tax assets, beginning balance 2,431 1,789
Charged/(credited) to the statement of income (705) 353
Tax charge relating to cash flow hedge 0 0
Exchange differences 757 289
Deferred income tax assets, ending balance 2,483 2,431
Tax loss carry forwards | Deferred tax assets temporary differences    
Changes in deferred tax liability [abstract]    
Charged/(credited) to the statement of income 11,907 31,074
Exchange differences 4,193 (11,135)
Changes in deferred tax asset [Abstract]    
Deferred income tax assets, beginning balance 97,118 107,191
Charged/(credited) to the statement of income 11,907 31,074
Tax charge relating to cash flow hedge (8,715) (52,282)
Exchange differences (4,193) 11,135
Deferred income tax assets, ending balance 96,117 97,118
Equity-settled share-based compensation | Deferred tax assets temporary differences    
Changes in deferred tax liability [abstract]    
Charged/(credited) to the statement of income 41 20
Exchange differences 0  
Changes in deferred tax asset [Abstract]    
Deferred income tax assets, beginning balance 5,640 5,620
Charged/(credited) to the statement of income 41 20
Tax charge relating to cash flow hedge 0 0
Exchange differences 0  
Deferred income tax assets, ending balance 5,681 5,640
Biological assets | Deferred tax assets temporary differences    
Changes in deferred tax liability [abstract]    
Charged/(credited) to the statement of income 0 (2,063)
Exchange differences 0 (336)
Changes in deferred tax asset [Abstract]    
Deferred income tax assets, beginning balance 0 1,727
Charged/(credited) to the statement of income 0 (2,063)
Tax charge relating to cash flow hedge 0 0
Exchange differences 0 336
Deferred income tax assets, ending balance 0 0
Others | Deferred tax assets temporary differences    
Changes in deferred tax liability [abstract]    
Charged/(credited) to the statement of income 19,623 149
Exchange differences 3,020 (280)
Changes in deferred tax asset [Abstract]    
Deferred income tax assets, beginning balance 9,137 8,708
Charged/(credited) to the statement of income 19,623 149
Tax charge relating to cash flow hedge 0 0
Exchange differences (3,020) 280
Deferred income tax assets, ending balance 25,740 9,137
Property, plant and equipment | Deferred tax liability temporary differences    
Changes in deferred tax liability [abstract]    
Deferred income tax liabilities, beginning balance 58,832 55,964
Charged/(credited) to the statement of income 23,249 3,380
Exchange differences (4,437) (512)
Deferred income tax liabilities, ending balance 77,644 58,832
Changes in deferred tax asset [Abstract]    
Charged/(credited) to the statement of income 23,249 3,380
Exchange differences 4,437 512
Biological assets | Deferred tax liability temporary differences    
Changes in deferred tax liability [abstract]    
Deferred income tax liabilities, beginning balance 14,122 15,963
Charged/(credited) to the statement of income 3,707 (2,752)
Exchange differences (1,057) 911
Deferred income tax liabilities, ending balance 16,772 14,122
Changes in deferred tax asset [Abstract]    
Charged/(credited) to the statement of income 3,707 (2,752)
Exchange differences 1,057 (911)
Others | Deferred tax liability temporary differences    
Changes in deferred tax liability [abstract]    
Deferred income tax liabilities, beginning balance 17,475 0
Charged/(credited) to the statement of income (15,583) 16,787
Exchange differences 733 688
Deferred income tax liabilities, ending balance 2,625 17,475
Changes in deferred tax asset [Abstract]    
Charged/(credited) to the statement of income (15,583) 16,787
Exchange differences $ (733) $ (688)