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Financial instruments (Details 9) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial instruments [Line Items] |  |
Current | $ 220,328 | $ 179,144
Non-current | 1,031,507 | 1,093,438
Total | 1,251,835 | 1,272,582
Bank borrowings [Member] |  |
Financial instruments [Line Items] |  |
Current | 163,568 | 101,270
Non-current | 0 | 0
Total | 163,568 | 101,270
Bonds issued [Member] |  |
Financial instruments [Line Items] |  |
Current | 13,494 | 58,973
Non-current | 1,031,507 | 1,059,706
Total | 1,045,001 | 1,118,679
Derivative liabilities [Member] |  |
Financial instruments [Line Items] |  |
Current | 5,979 | 1,920
Non-current | 0 | 0
Total | 5,979 | 1,920
Hedging liabilities [Member] |  |
Financial instruments [Line Items] |  |
Current | 37,287 | 16,981
Non-current | 0 | 33,732
Total | $ 37,287 | $ 50,713

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