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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 |

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