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Cash and cash equivalents (Details 2) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | $ 509,102 | $ 588,530 | $ 556,066 | $ 630,438
Peso [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 7,190 | 8,240 |  |
Dollar [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 454,402 | 558,572 |  |
Euro [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 17,144 | 3,131 |  |
Mexican Peso [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 1,378 | 2,103 |  |
South African Rand [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 14,286 | 3,929 |  |
Japanese Yen [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 1,646 | 1,559 |  |
Peruvian Sol [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 3 | 4 |  |
Indian Rupee [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 6 | 6 |  |
Chinese Yuan [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 11,597 | 2,484 |  |
Indonesian Rupee [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 3 | 3 |  |
Argentine Peso [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 3 |  |
Pound Sterling [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 19 | 3 |  |
Australian dollar [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 1,411 | 8,492 |  |
South Korean won [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 16 | 0 |  |
UAE dirham [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Polish Ztoly [Member] |  |  |  |
Cash And Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | $ 1 | $ 1 |  |

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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 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_i&doctype=Standard -URIDate 2020-01-01 + Details
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