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Share Based Payments (Narrative) (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 20, 2020 $ / shares | Sep. 30, 2020 EquityInstruments shares | Sep. 30, 2020 EquityInstruments shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 $ / shares $ / shares | Dec. 31, 2019 USD ($) EquityInstruments $ / shares | Dec. 31, 2020 $ / shares | Apr. 20, 2020 $ / shares | Dec. 31, 2019 $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Expense from share-based payment transactions with employees |  |  |  | $ 12,444,000 |  | $ 6,013,000 |  |  |
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 |  |  |  | $ 12,388,000 |  | $ 5,471,000 |  |  |
Fair value per share granted options | (per share) | $ 2.36 |  |  |  | $ 3.62 | $ 3.62 |  | $ 3.32 | $ 4.83
Equity Settled, Restricted Share Units [Member] |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Granted, other units |  |  |  | 815,220 |  | 633,914 |  |  |
Fair value per share granted options | (per share) |  |  |  | $ 2.36 | $ 3.62 | $ 3.62 | $ 3.32 |  | $ 4.83
Performance Share Units |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Granted, other units | EquityInstruments |  | 0 | 0 |  |  | 422,609 |  |  |
Fair value per unit | (per share) |  |  |  |  | $ 4.83 | $ 3.62 |  |  |
Stock Options |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Expense from share-based payment transactions with employees |  |  |  | $ 56,000 |  | $ 542,000 |  |  |
Stock options available for issuance | shares |  | 2,092,236 | 2,092,236 |  |  |  |  |  |
Vesting Tranche One Period [member] | Restricted Share Units |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Vesting tranche percentage sharebased arrangements | 20.00% |  |  |  |  |  |  |  |
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] | Restricted Share Units |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Vesting tranche percentage sharebased arrangements | 30.00% |  |  |  |  |  |  |  |
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] | Restricted Share Units |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
Vesting tranche percentage sharebased arrangements | 50.00% |  |  |  |  |  |  |  |
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] | 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] | 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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