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Financial assets and liabilities - Fair values to the fair value hierarchy (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Assets | $ 1,192,585 | $ 1,168,805
Level 1 | At fair value | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Liabilities | 0 | 0
Level 1 | At fair value | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Assets | 0 | 0
Level 1 | For which fair values are disclosed | Borrowings | Liabilities To Banks |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Liabilities | 0 | 0
Level 1 | For which fair values are disclosed | Borrowings | Term loan |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Liabilities | 0 | 0
Level 1 | For which fair values are disclosed | Borrowings | Local bank loans |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Liabilities | 0 | 0
Level 2 | At fair value | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Liabilities | 4,473 | 5,193
Level 2 | At fair value | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Assets | 4,554 | 3,554
Level 2 | For which fair values are disclosed | Borrowings | Liabilities To Banks |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Liabilities | 0 | 0
Level 2 | For which fair values are disclosed | Borrowings | Term loan |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Liabilities | 669,119 | 684,234
Level 2 | For which fair values are disclosed | Borrowings | Local bank loans |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Liabilities | 0 | 12,512
Level 3 | At fair value | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Liabilities | 0 | 0
Level 3 | At fair value | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Assets | 0 | 0
Level 3 | For which fair values are disclosed | Borrowings | Liabilities To Banks |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Liabilities | 0 | 0
Level 3 | For which fair values are disclosed | Borrowings | Term loan |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Liabilities | 0 | 0
Level 3 | For which fair values are disclosed | Borrowings | Local bank loans |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Liabilities | $ 0 | $ 0

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