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Retirement plans - Additional information (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) year | Dec. 31, 2017 USD ($)
Disclosure of net defined benefit liability (asset) [line items] |  |
Retirement obligation (asset) | $ 19,663 | $ 18,402
Weighted average duration of defined benefit obligation | year | 9 |
Unfunded | Foreign | Chile |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Retirement obligation (asset) | $ 24,800 | 25,100
Estimate of contributions expected to be paid to plan for 2019 | 5,400 |
Funded | Foreign | Europe |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Retirement obligation (asset) | (400) | (100)
Funded | Domestic |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Retirement obligation (asset) | (4,700) | $ (6,600)
Estimate of contributions expected to be paid to plan for 2019 | $ 900 |

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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_148_d_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&doctype=Standard -URIDate 2017-03-09 + Details
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