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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, 2017 | $ 418,168,000 | $ 14,726,000 | $ 147,000 | $ 27,000 |  | $ 1,115,000 | $ 129,401,000 | $ 563,584,000
Equity at beginning of period, shares at Dec. 31, 2017 | shares | 159,636,983 |  |  |  |  |  |  |
Net income for the period |  |  |  |  |  |  | 33,990,000 | 33,990,000
Other comprehensive income (loss) |  |  | (156,000) | (69,000) |  |  |  | (225,000)
Comprehensive income for the year |  |  | (156,000) | (69,000) |  |  | 33,990,000 | 33,765,000
Exercise of warrants | $ 1,890,000 | (944,000) |  |  |  |  |  | 946,000
Exercise of warrants, shares | 204,462 |  |  |  |  |  |  |
Exercise of stock options | $ 21,000 | (8,000) |  |  |  |  |  | $ 13,000
Exercise of stock options, shares | 20,000 |  |  |  |  |  |  | 20,000
Shares issued for share units | $ 388,000 | (388,000) |  |  |  |  |  |
Shares issued for share units (in shares) | 78,150 |  |  |  |  |  |  |
Share-based payments |  | 4,496,000 |  |  |  |  |  | $ 4,496,000
Subtotal of transactions with owners of the Company | $ 2,299,000 | 3,156,000 |  |  |  |  |  | 5,455,000
Subtotal of transactions with owners of the Company, shares | shares | 302,612 |  |  |  |  |  |  |
Equity at end 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 end of period, shares at Dec. 31, 2018 | shares | 159,939,595 |  |  |  |  |  |  |
Net income for the period |  |  |  |  |  |  | 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 for share units | $ 1,678,000 | (1,678,000) |  |  |  |  |  |
Shares issued for share units (in shares) | 351,958 |  |  |  |  |  |  |
Share-based payments |  | 4,666,000 |  |  |  |  |  | 4,666,000
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 |  |  |  |  |  |  |

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