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OTHER RESERVES AND NON-CONTROLLING INTEREST (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of reserves within equity [line items] |  |
Beginning balance | $ 1,023,928 | $ 901,879
Gain on marketable securities at FVTOCI, net of tax | (37,686) | 25,948
Unrealized gain on effective portion of derivative, net of tax | (2,907) | 526
Stock options exercised | 5,320 | 2,339
Share-based compensation | 2,156 | 2,219
Recognition of joint venture |  | 17,231
Funding from non-controlling interest | 15,196 | 2,320
Total comprehensive (loss) income | (40,624) | 97,940
Ending balance | 1,005,976 | 1,023,928
Other reserves |  |
Disclosure of reserves within equity [line items] |  |
Beginning balance | 24,998 | (1,014)
Stock options exercised | (2,864) | (1,339)
Share-based compensation | 2,156 | 2,219
Recognition of joint venture |  | (1,342)
Total comprehensive (loss) income | (40,593) | 26,474
Ending balance | (16,303) | 24,998
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 | 3,353 | (23,121)
Gain on marketable securities at FVTOCI, net of tax | (37,686) | 25,948
Unrealized gain on effective portion of derivative, net of tax | (2,907) | 526
Ending balance | (37,240) | 3,353
Share-based compensation reserve |  |
Disclosure of reserves within equity [line items] |  |
Beginning balance | 50,404 | 49,524
Stock options exercised | (2,864) | (1,339)
Share-based compensation | 2,156 | 2,219
Ending balance | 49,696 | 50,404
Other |  |
Disclosure of reserves within equity [line items] |  |
Beginning balance | (29,540) | (28,198)
Recognition of joint venture | 0 | (1,342)
Ending balance | (29,540) | (29,540)
Transactions with non-controlling interests |  |
Disclosure of reserves within equity [line items] |  |
Beginning balance | 23,043 | 0
Recognition of joint venture | 0 | 18,573
Funding from non-controlling interest | 15,196 | 2,320
Total comprehensive (loss) income | (6,410) | 2,150
Ending balance | $ 31,829 | $ 23,043

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