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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock
Lexam VG Gold
Common Stock
Warrants
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Flow Through Common Shares
Lexam VG Gold
Total
Balance at Dec. 31, 2014   $ 1,360,668   $ 124 $ (919,577)     $ 441,215
Balance (in shares) at Dec. 31, 2014   300,100            
Increase (Decrease) in Shareholders' Equity                
Stock-based compensation (note 11)   $ 1,305           1,305
Return of capital distribution (note 10)   (1,503)           (1,503)
Shares issued for settlement of accounts payable   $ 443           443
Shares issued for settlement of accounts payable (in shares)   430            
Share repurchase (note 10)   $ (1,769)           (1,769)
Share repurchase (note 10) (in shares)   (1,896)            
Unrealized gain (loss) on available-for-sale securities, net of taxes (note 3)       (949)       (949)
Net (loss) income         (20,450)     (20,450)
Balance at Dec. 31, 2015   $ 1,359,144   (825) (940,027)     418,292
Balance (in shares) at Dec. 31, 2015   298,634            
Increase (Decrease) in Shareholders' Equity                
Stock-based compensation (note 11)   $ 1,039           1,039
Return of capital distribution (note 10)   (2,986)           (2,986)
Exercise of stock options (note 11)   $ 3,730           $ 3,730
Exercise of stock options (note 11) (in shares)   1,494           1,457,000
Share repurchase (note 10)   $ (582)           $ (582)
Share repurchase (note 10) (in shares)   (558)            
Other-than-temporary impairment on marketable equity securities (note 3)       882       882
Unrealized gain (loss) on available-for-sale securities, net of taxes (note 3)       1,609       1,609
Net (loss) income         21,055     21,055
Balance at Dec. 31, 2016   $ 1,360,345   1,666 (918,972)     443,039
Balance (in shares) at Dec. 31, 2016   299,570            
Increase (Decrease) in Shareholders' Equity                
Stock-based compensation (note 11)   $ 1,311           1,311
Return of capital distribution (note 10)   (3,059)           (3,059)
Shares issued in connection with the acquisition of Lexam VG Gold (note 10) $ 38,141           $ 38,141  
Shares issued in connection with the acquisition of Lexam VG Gold (note 10) (in shares) 12,687              
Exercise of stock options (note 11)   $ 122           $ 122
Exercise of stock options (note 11) (in shares)   94           94,000
Share repurchase (note 10) (in shares)               0
Other-than-temporary impairment on marketable equity securities (note 3)       356       $ 356
Unrealized gain (loss) on available-for-sale securities, net of taxes (note 3)       1,818       1,818
Reclassification of unrealized gain on marketable securities disposed of during the period, net of taxes (note 3)       (840)       (840)
Shares issued in connection with the equity issuance (note 10)   $ 39,397       $ 7,799    
Shares issued in connection with the equity issuance (note 10) (in shares)   20,700       4,000    
Net (loss) income         (10,634)     (10,634)
Balance at Dec. 31, 2017   $ 1,444,056 $ 3,823 $ 3,000 $ (929,606)     521,273
Balance (in shares) at Dec. 31, 2017   337,051            
Increase (Decrease) in Shareholders' Equity                
Warrants issued in connection with the equity issuance (note 10)     $ 3,823         $ 3,823