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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

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