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Equity-settled share-based payments - Restricted Share and Restricted Stock Unit Plan (Details) |  |  |  |  |  |  | 12 Months Ended
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May 15, 2017 USD ($) | Apr. 01, 2017 USD ($) | May 15, 2016 USD ($) | Apr. 01, 2016 USD ($) | May 15, 2015 USD ($) | Apr. 01, 2015 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  | $ 5,552,000 | $ 4,796,000 | $ 4,396,000
Grant date, fair value (usd per share) | $ | $ 12.14 | $ 11.88 | $ 12.52 | $ 12.63 | $ 8.62 | $ 9.45 |  |  |
Possibility of ceasing employment before vesting | 0.00% | 0.00% | 0.00% | 5.00% | 0.00% | 5.00% |  |  |
Restricted Stock And Restricted Stock Units (RSU) [Member] |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  |  | 3 years |  |
Vesting percentage |  |  |  |  |  |  | 33.00% |  |
Maximum shares authorised |  |  |  |  |  |  | 2,474,701 |  |
Restricted stock units |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  | $ 5,600,000 | $ 4,800,000 |
Number of shares outstanding, Jan 1 |  |  |  |  |  |  | 1,000,000 | 1,018,000 | 861,000
Number of shares granted |  |  |  |  |  |  | 488,000 | 464,000 | 626,000
Number of shares forfeited |  |  |  |  |  |  | (29,000) | (29,000) | (37,000)
Number of shares vested |  |  |  |  |  |  | (490,000) | (453,000) | (432,000)
Number of shares outstanding, Dec 31 |  |  |  |  |  |  | 969,000 | 1,000,000 | 1,018,000

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- Definition The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 51 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_51_a&doctype=Standard -URIDate 2017-03-09 + Details
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