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Cash and cash equivalents (Details 2) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | $ 556,066 | $ 630,438 | $ 514,669 | $ 527,259
Chilean Peso [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 157,500 | 579 |  |
US Dollar [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 353,037 | 612,727 |  |
Euro [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 4,739 | 9,782 |  |
Australian dollar [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 29,598 | 0 |  |
Mexican Peso [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 1,242 | 258 |  |
South African Rand [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 5,843 | 4,074 |  |
Japanese Yen [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 1,786 | 1,773 |  |
Peruvian Sol [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 7 | 8 |  |
Brazilian Real [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 38 |  |
Chinese Yuan [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 2,305 | 1,143 |  |
Indian Rupee [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 3 | 0 |  |
UAE dirham [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 1 | 0 |  |
Argentine Peso [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 2 | 1 |  |
Pound Sterling [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | $ 3 | $ 55 |  |

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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 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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