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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