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Share Based Payments (Narrative) (Details) | 12 Months Ended |
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Dec. 31, 2019 $ / shares shares | Dec. 31, 2019 USD ($) EquityInstruments $ / shares shares | Dec. 31, 2018 $ / shares $ / shares | Dec. 31, 2018 USD ($) Y EquityInstruments $ / shares | Dec. 31, 2018 $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Expense from share-based payment transactions with employees |  | $ 6,013,000 |  | $ 3,701,000 |
Granted, options |  | 0 |  | 648,502 |
Option life, share options granted | Y |  |  |  | 3.00 |
Description of expected forfeiture rate |  |  |  | 5.57 |
Expected dividend, share options granted |  |  |  | $ 0.00 |
Description of option pricing model, share options granted |  |  |  | BlackScholes model |
Deferred, Restricted and Performance Share Units |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Expense from share-based payment transactions with employees |  | $ 5,471,000 |  | $ 2,343,000 |
Restricted Share Units |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Granted, other units | EquityInstruments |  | 633,914 |  | 422,030 |
Fair value per unit | (per share) | $ 4.83 | $ 3.62 |  |  |
Performance Share Units |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Granted, other units | EquityInstruments |  | 422,609 |  | 1,002,166 |
Fair value per unit | (per share) | $ 4.83 | $ 3.62 | $ 6.20 | $ 4.71 |
Stock Options |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Expense from share-based payment transactions with employees |  | $ 542,000 |  | $ 1,357,000 |
Stock options available for issuance | shares | 1,574,403 | 1,574,403 |  |  |
Vesting Tranche One Period [member] | Performance Share Units |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting tranche percentage sharebased arrangements |  | 20.00% |  |  |
Vesting Tranche Two Period [member] | Performance Share Units |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting tranche percentage sharebased arrangements |  | 30.00% |  |  |
Vesting Tranche Three Period [member] | Performance Share Units |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting tranche percentage sharebased arrangements |  | 50.00% |  |  |
Bottom of range [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Risk free interest rate, share options granted |  |  |  | 1.79% |
Expected volatility, share options granted |  |  |  | 67.56% |
Fair value per share granted options | (per share) |  |  | $ 2.06 | $ 2.06 | $ 2.69
Bottom of range [member] | Restricted Share Units |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Fair value per unit | (per share) |  |  | $ 6.20 | $ 4.71 |
Bottom of range [member] | Performance Share Units |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting tranche percentage sharebased arrangements |  | 50.00% |  |  |
Top of range [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Risk free interest rate, share options granted |  |  |  | 1.90% |
Expected volatility, share options granted |  |  |  | 68.16% |
Fair value per share granted options | (per share) |  |  | $ 2.38 | $ 2.38 | $ 3.09
Top of range [member] | Restricted Share Units |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Fair value per unit | (per share) |  |  | $ 7.15 | $ 5.54 |
Top of range [member] | Performance Share Units |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting tranche percentage sharebased arrangements |  | 200.00% |  |  |
Top of range [member] | Stock Options |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Maximum issue of shares permitted | shares |  | 12,200,000 |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References No definition available. + Details
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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2018-03-16 + Details
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