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Consolidated Statements of Changes in Equity | Issued capital [member] USD ($) shares | Equity reserve [member] USD ($) | Hedging reserve [member] USD ($) | Fair value reserve [member] USD ($) | Reserves convertible Debentures [member] USD ($) | Foreign currency reserves [member] USD ($) | Retained earnings [member] USD ($) | USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Equity at beginning of period at Dec. 31, 2018 | $ 420,467,000 | $ 17,882,000 | $ (9,000) | $ (42,000) |  | $ 1,115,000 | $ 163,391,000 | $ 602,804,000
Equity at beginning of period, shares at Dec. 31, 2018 | shares | 159,939,595 |  |  |  |  |  |  |
Net income for the year |  |  |  |  |  |  | 23,796,000 | 23,796,000
Other comprehensive income (loss) |  |  | (665,000) |  |  |  |  | (665,000)
Comprehensive income for the year |  |  | (665,000) |  |  |  | 23,796,000 | 23,131,000
Shares issued on vesting of share units | $ 1,678,000 | (1,678,000) |  |  |  |  |  |
Shares issued on vesting of share units (in shares) | 351,958 |  |  |  |  |  |  |
Share-based payments |  | 4,666,000 |  |  |  |  |  | 4,666,000
Equity portion of convertible debenture, net of tax (note 17 (b)) |  |  |  |  | $ 4,825,000 |  |  | 4,825,000
Subtotal of transactions with owners of the Company | $ 1,678,000 | 2,988,000 |  |  | 4,825,000 |  |  | 9,491,000
Subtotal of transactions with owners of the Company, shares | shares | 351,958 |  |  |  |  |  |  |
Equity at end of period at Dec. 31, 2019 | $ 422,145,000 | 20,870,000 | (674,000) | (42,000) | 4,825,000 | 1,115,000 | 187,187,000 | 635,426,000
Equity at end of period, shares at Dec. 31, 2019 | shares | 160,291,553 |  |  |  |  |  |  |
Net income for the year |  |  |  |  |  |  | 21,553,000 | 21,553,000
Other comprehensive income (loss) |  |  | (204,000) | (382,000) |  |  |  | (586,000)
Comprehensive income for the year |  |  | (204,000) | (382,000) |  |  | 21,553,000 | 20,967,000
Issuance of common shares | $ 69,000,000 |  |  |  |  |  |  | 69,000,000
Issuance of common shares, shares | shares | 23,000,000 |  |  |  |  |  |  |
Share issuance costs | $ (3,358,000) |  |  |  |  |  |  | (3,358,000)
Exercise of stock options | $ 1,438,000 | (427,000) |  |  |  |  |  | $ 1,011,000
Exercise of stock options, shares | 211,626 |  |  |  |  |  |  | 211,626
Shares issued on vesting of share units | $ 3,081,000 | (3,081,000) |  |  |  |  |  |
Shares issued on vesting of share units (in shares) | 692,548 |  |  |  |  |  |  |
Share-based payments |  | 2,724,000 |  |  |  |  |  | $ 2,724,000
Subtotal of transactions with owners of the Company | $ 70,161,000 | (784,000) |  |  |  |  |  | 69,377,000
Subtotal of transactions with owners of the Company, shares | shares | 23,904,174 |  |  |  |  |  |  |
Equity at end of period at Dec. 31, 2020 | $ 492,306,000 | $ 20,086,000 | $ (878,000) | $ (424,000) | $ 4,825,000 | $ 1,115,000 | $ 208,740,000 | $ 725,770,000
Equity at end of period, shares at Dec. 31, 2020 | shares | 184,195,727 |  |  |  |  |  |  |

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