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Share-based payments (Tables) | 6 Months Ended
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Jun. 30, 2018
Share-Based Payment Arrangements [Abstract] |
Disclosure of detail as to expenses recorded within the profit and loss with respect to the LTIP | The following table details the costs charged to the income statement with respect to the 2015 Plan, 2016 Plan and 2017 Plan.
|  | USD k
|  | For the Six Months Ended Jun 30,
|  | 2018 |  | 2017
Expense arising from equity-settled share based payment transactions (2015 Plan) |  | 777 |  |  | 1,241 |
Expense arising from equity-settled share based payment transactions (2016 Plan) |  | 2,253 |  |  | 1,968 |
Expense arising from equity-settled share based payment transactions (2017 Plan) |  | 2,360 |  |  | — |
Expenses arising form equity-settled share based 2018 incentive |  | 563 |  |  | — |
Total expenses |  | 5,953 |  |  | 3,209 |
Disclosure of the number of and movements in PSUs | The following table illustrates the number of, and movements in, performance share units ("PSUs") during the period.
|  | 2015 Plan |  | 2016 Plan |  | 2017 Plan |  | Total
|  | Number of PSUs |  | Number of PSUs |  | Number of PSUs |  | Number of PSUs
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Outstanding at January 1, |  | 452,816 |  |  | 454,959 |  |  | 686,038 |  |  | 690,279 |  |  | 472,040 |  |  |  |  |  | 1,610,894 |  |  | 1,145,238 |
Granted during the period |  | — |  |  | — |  |  | 113 |  |  | — |  |  | 830 |  |  |  |  |  | 943 |  |  | — |
Forfeited during the period |  | (5,694 | ) |  | (1,515 | ) |  | (8,544 | ) |  | (4,241 | ) |  | (5,521 | ) |  |  |  |  | (19,759 | ) |  | (5,756 | )
Vested during the period |  | (447,122 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  |  | (447,122 | ) |  | — |
Outstanding at June 30, |  | — |  |  | 453,444 |  |  | 677,607 |  |  | 686,038 |  |  | 467,349 |  |  | — |  |  | 1,144,956 |  |  | 1,139,482 |
Disclosure of indirect measurement of fair value of goods or services received, other equity instruments granted during period | The following table lists the inputs to the model used for the grant date fair values of the 2015 Plan, 2016 Plan and 2017 Plan.
| 2015 Plan |  | 2016 Plan |  | 2017 Plan
Dividend Yield (%) | 2.14% |  | 2.23% |  | 1.88%
Expected Volatility OEC (%) | 25.16% |  | 32.07% |  | 33.77%
Expected Volatility Peer Group (%) | 13.90% |  | 18.12% |  | 17.30%
Correlation | 0.5234 |  | 0.4952 |  | 0.4574
Risk-free interest rate (%) | 0.90% |  | 0.76% |  | 1.45%
Model used | Monte Carlo |  | Monte Carlo |  | Monte Carlo
Weighted average fair value of PSUs granted in USD | 17.41 |  | 17.21 |  | 24.89

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- Definition The disclosure of information about indirect, by reference to the fair value of the equity instruments granted, measurement of the fair value of goods or services received as consideration for the entity's other equity instruments (ie other than share options). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The disclosure of the number and weighted average exercise prices of other equity instruments (ie other than share options). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The explanation that enables users of financial statements to understand the effect of share-based payment transactions on the entity's profit (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 50 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_50&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Share-Based Payment Arrangements [Abstract] + References No definition available. + Details
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