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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