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Financial instruments (Details 10) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial instruments [Line Items]    
Current $ 298,822 $ 23,585
Non-current 1,518,926 1,330,382
Total 1,817,748 1,353,967
Bank borrowings [Member] | Financial liabilities at amortised cost, category [member]    
Financial instruments [Line Items]    
Current 199 300
Non-current 69,138 68,870
Total 69,337 69,170
Unsecured obligations [Member] | Financial liabilities at amortised cost, category [member]    
Financial instruments [Line Items]    
Current 280,578 15,145
Non-current 1,403,108 1,249,479
Total 1,683,686 1,264,624
For hedging [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]    
Financial instruments [Line Items]    
Current 7,183 5,285
Non-current 16,477 12,033
Total 23,660 17,318
Non-hedging liabilities [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]    
Financial instruments [Line Items]    
Current 3,168 2,855
Total 3,168 $ 2,855
Lease Liability [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]    
Financial instruments [Line Items]    
Current 7,694  
Non-current 30,203  
Total $ 37,897