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Recent accounting pronouncements and future accounting policy changes (Details) - USD ($) $ in Thousands | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |
Provisions |  | $ 13,105 | $ 9,700 | $ 7,432
Bottom of range | IFRS 16 |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |
Right-of-use assets | $ 9,000 |  |  |
Lease liabilities | 13,000 |  |  |
Top of range | IFRS 16 |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |
Right-of-use assets | 11,000 |  |  |
Lease liabilities | 15,000 |  |  |
Deferred lease inducement |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |
Provisions |  | $ 2,292 |  |
Deferred lease inducement | IFRS 16 |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |
Provisions | $ 2,000 |  |  |

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- Definition The amount of liabilities of uncertain timing or the amount recognised when: (a) the entity has a present obligation (legal or constructive) as a result of a past event; (b) it is probable (ie more likely than not) that an outflow of resources embodying economic benefits will be required to settle the obligation; and (c) a reliable estimate can be made of the amount of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_l&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2017-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2017-03-01&anchor=para_53_j&doctype=Standard -URIDate 2017-03-09 + Details
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