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OTHER RESERVES AND NON-CONTROLLING INTEREST (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of reserves within equity [line items] |  |
Beginning balance | $ 901,879 | $ 447,183
Gain on marketable securities at FVTOCI, net of tax | 25,948 | 51,161
Unrealized gain on effective portion of derivative, net of tax | 526 | 710
Options issued pursuant to the acquisition of Seabee Gold Operation (note 3) |  | 329,035
Stock options exercised | 2,339 | 6,700
Share-based compensation | 2,219 | 2,133
Recognition of joint venture | 17,231 |
Funding from non-controlling interest | 2,320 |
Total comprehensive income | 97,940 | 116,828
Ending balance | 1,023,928 | 901,879
Other reserves |  |
Disclosure of reserves within equity [line items] |  |
Beginning balance | (1,014) | (54,805)
Options issued pursuant to the acquisition of Seabee Gold Operation (note 3) |  | 4,045
Stock options exercised | (1,339) | (4,258)
Share-based compensation | 2,219 | 2,133
Total comprehensive income | 26,474 | 51,871
Ending balance | 24,998 | (1,014)
Foreign currency translation reserve |  |
Disclosure of reserves within equity [line items] |  |
Beginning balance | 781 | 781
Ending balance | 781 | 781
Revaluation reserves |  |
Disclosure of reserves within equity [line items] |  |
Beginning balance | (23,121) | (74,992)
Gain on marketable securities at FVTOCI, net of tax | 25,948 | 51,161
Unrealized gain on effective portion of derivative, net of tax | 526 | 710
Ending balance | 3,353 | (23,121)
Share-based compensation reserve |  |
Disclosure of reserves within equity [line items] |  |
Beginning balance | 49,524 | 47,604
Options issued pursuant to the acquisition of Seabee Gold Operation (note 3) | 0 | 4,045
Stock options exercised | (1,339) | (4,258)
Share-based compensation | 2,219 | 2,133
Ending balance | 50,404 | 49,524
Other |  |
Disclosure of reserves within equity [line items] |  |
Beginning balance | (28,198) | (28,198)
Recognition of joint venture | (1,342) | 0
Ending balance | (29,540) | (28,198)
Transactions with non-controlling interests |  |
Disclosure of reserves within equity [line items] |  |
Beginning balance | 0 | 0
Recognition of joint venture | 18,573 | 0
Funding from non-controlling interest | 2,320 | 0
Total comprehensive income | 2,150 | 0
Ending balance | $ 23,043 | $ 0

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