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Financial instruments (Details 10) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial instruments [Line Items] |  |
Long-term bank borrowings | $ (1,031,507,000) | $ (1,059,706,000)
Short-term bank borrowings | (177,062,000) | (160,243,000)
Total bank borrowings | 1,486,420,000 | 1,550,290,000
Bank borrowings [Member] |  |
Financial instruments [Line Items] |  |
Long-term bank borrowings | 0 | 0
Short-term bank borrowings | 163,568,000 | 101,270
Short-term borrowings and current portion of long-term borrowings | 163,568,000 | 101,270
Total bank borrowings | $ 163,568,000 | $ 101,270

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