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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY
shares in Thousands, $ in Thousands
USD ($)
shares
Share capital
USD ($)
shares
Contributed surplus
USD ($)
Accumulated other comprehensive loss
USD ($)
Deficit
USD ($)
Non- controlling interests
USD ($)
Beginning balance number of shares outstanding (in shares) at Dec. 31, 2016 | shares   964,892        
Beginning balance equity at Dec. 31, 2016 $ 1,454,564 $ 2,151,993 $ 56,191 $ (95,435) $ (667,760) $ 9,575
Net income for the year 61,566       56,852 4,714
Impact of change in credit spread on convertible notes (Note 10) 0          
Unrealized gain (loss) on investments, net of deferred tax expense $ 1,141     1,141    
Number of shares issued on exercise of stock options (in shares) | shares 13,708 13,343        
Shares issued on exercise of stock options (Note 12) $ 25,658 $ 25,658        
Shares pending issuance on exercise of stock options (in shares) | shares   174        
Shares pending issuance on exercise of stock options 410 $ 410        
Shares issued on vesting of RSUs (in shares) | shares   1,760        
Shares issued on vesting of RSUs (Note 12) 0 $ 3,584 (3,584)      
Interest on loan to non-controlling interest         0  
Shares issued for non-controlling interest (in shares) | shares   764        
Shares issued for purchase of non-controlling interest 2,000 $ 2,000        
Share-based payments (Note 12) 21,054   21,054      
Transfer to share capital on exercise of stock options 0 $ 13,622 (13,622)      
Ending balance number of shares outstanding (in shares) at Dec. 31, 2017 | shares   980,933        
Ending balance equity at Dec. 31, 2017 1,566,393 $ 2,197,267 60,039 (94,294) (610,908) 14,289
Net income for the year 45,121       28,938 16,183
Impact of change in credit spread on convertible notes (Note 10) (160)     (160)    
Unrealized gain (loss) on investments, net of deferred tax expense $ (6,221)     (6,221)    
Number of shares issued on exercise of stock options (in shares) | shares 12,347 12,173        
Shares issued on exercise of stock options (Note 12) $ 22,397 $ 22,397        
Shares pending issuance on exercise of stock options (in shares) | shares   645        
Shares pending issuance on exercise of stock options 1,364 $ 1,364        
Shares issued on vesting of RSUs (in shares) | shares   671        
Shares issued on vesting of RSUs (Note 12) 0 $ 1,792 (1,792)      
Payments received from non-controlling interest 434         434
Acquisition of non-controlling interest (Note 8) (2,500)       (2,500)  
Sale of non-controlling interest (Note 8) 47,000       (10,199) 57,199
Net loan receivable on sale of non-controlling interest (Note 8) (45,050)         (45,050)
Interest on loan to non-controlling interest 203       1,352 (1,149)
Shares issued for mineral property interests (in shares) | shares   200        
Shares issued for mineral property interest 486 $ 486        
Shares issued for purchase of non-controlling interest 0          
Share-based payments (Note 12) 23,386   23,386      
Transfer to share capital on exercise of stock options 0 $ 10,744 (10,744)      
Ending balance number of shares outstanding (in shares) at Dec. 31, 2018 | shares   994,622        
Ending balance equity at Dec. 31, 2018 $ 1,652,853 $ 2,234,050 $ 70,889 $ (146,153) $ (547,839) $ 41,906