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Share-based compensation - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of shares reserved for future grants of stock options and share appreciation rights | 3,953,471 |
Liabilities from share-based payment transactions | $ 111,405 | $ 53,725
SARs and TSARs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Maximum term | 7 years |
Share-based compensation arrangement vesting rights, percentage | 33.33% |
Fair value of share-based payment transactions | $ 69,800 |
Liabilities from share-based payment transactions | 65,200 |
Intrinsic value of liabilities from share-based payment transactions | $ 4,600 |
Weighted average remaining vesting period | 1 year 6 months |
Expense from share-based payment transactions with employees | $ 45,100 | 26,900
Expense from share-based payment transactions with employees, effect of change in share price | 37,800 | 20,000
Deferred, Restricted and Performance Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value of share-based payment transactions | 55,900 |
Liabilities from share-based payment transactions | 46,100 |
Intrinsic value of liabilities from share-based payment transactions | $ 9,800 |
Weighted average remaining vesting period | 1 year 6 months |
Expense from share-based payment transactions with employees | $ 33,000 | 6,000
Expense from share-based payment transactions with employees, effect of change in share price | $ 29,900 | 2,800
Stock Options |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Maximum term | 7 years |
Share-based compensation arrangement vesting rights, percentage | 33.33% |
Expense from share-based payment transactions with employees | $ 500 | $ 600

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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The intrinsic value of liabilities arising from share-based transactions for which the counterparty's right to cash or other assets had vested by the end of the period (for example, vested share appreciation rights). The intrinsic value is the difference between the fair value of the shares to which the counterparty has the (conditional or unconditional) right to subscribe, or which it has the right to receive, and the price (if any) that the counterparty is (or will be) required to pay for those shares. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services, for which the counterparty's right to cash or other assets had vested by the end of the period (for example, vested share appreciation rights). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 51 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_51_b_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 51 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_51_b_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of shares reserved for issue under options and contracts for the sale of shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_vii&doctype=Standard -URIDate 2017-03-09 + Details
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