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Cash and cash equivalents (Details 4) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash And Cash Equivalent [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  |  | $ 630,438 | $ 514,669 | $ 527,259 | $ 354,566
Liquid investments |  |  | 360,941 | 284,160 |  |
Borrowings - repayable within one year (including overdraft) |  |  | (177,062) | (160,243) |  |
Borrowings - repayable after one year |  |  | (1,031,507) | (1,059,706) |  |
Cash and liquid investments |  |  | 991,379 | 798,829 |  |
Gross debt - fixed interest rates |  |  | (1,208,569) | (1,219,949) |  |
Net debt | $ (217,190) | $ (421,120) | (217,190) | (421,120) | (471,921) |
Beginning Balance | (421,120) | (471,921) |  |  |  |
Cash flows | 195,598 | 57,082 |  |  |  |
Foreign exchange adjustments | 8,121 | (12,673) |  |  |  |
Other non - cash movements | 211 | 6,392 |  |  |  |
Ending Balance | (217,190) | (421,120) |  |  |  |
Borrow. Due within 1 year [member] |  |  |  |  |  |
Cash And Cash Equivalent [Line Items] |  |  |  |  |  |
Net debt | (160,243) | (399,275) | (177,062) | (160,243) | (399,275) |
Beginning Balance | (160,243) | (399,275) |  |  |  |
Cash flows | (16,288) | 277,000 |  |  |  |
Foreign exchange adjustments | (531) | (1,879) |  |  |  |
Other non - cash movements | 0 | (36,089) |  |  |  |
Ending Balance | (177,062) | (160,243) |  |  |  |
Borrow. Due after 1 year [member] |  |  |  |  |  |
Cash And Cash Equivalent [Line Items] |  |  |  |  |  |
Net debt | (1,059,706) | (1,217,172) | (1,031,507) | (1,059,706) | (1,217,172) |
Beginning Balance | (1,059,706) | (1,217,172) |  |  |  |
Cash flows | 54,275 | 140,000 |  |  |  |
Foreign exchange adjustments | (26,287) | (25,015) |  |  |  |
Other non - cash movements | 211 | 42,481 |  |  |  |
Ending Balance | (1,031,507) | (1,059,706) |  |  |  |
Cash/bank overdraft [Member] |  |  |  |  |  |
Cash And Cash Equivalent [Line Items] |  |  |  |  |  |
Net debt | 514,669 | 527,259 | 630,438 | 514,669 | 527,259 |
Beginning Balance | 514,669 | 527,259 |  |  |  |
Cash flows | 98,285 | (20,362) |  |  |  |
Foreign exchange adjustments | 17,484 | 7,772 |  |  |  |
Other non - cash movements | 0 | 0 |  |  |  |
Ending Balance | 630,438 | 514,669 |  |  |  |
Liquid Investments [Member] |  |  |  |  |  |
Cash And Cash Equivalent [Line Items] |  |  |  |  |  |
Net debt | 284,160 | 617,267 | $ 360,941 | $ 284,160 | $ 617,267 |
Beginning Balance | 284,160 | 617,267 |  |  |  |
Cash flows | 59,326 | (339,556) |  |  |  |
Foreign exchange adjustments | 17,455 | 6,449 |  |  |  |
Other non - cash movements | 0 | 0 |  |  |  |
Ending Balance | $ 360,941 | $ 284,160 |  |  |  |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_i&doctype=Standard -URIDate 2017-03-09 + Details
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