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OTHER RESERVES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reserves within equity [line items] |  |
Beginning balance | $ 1,133,954 | $ 1,005,976
Gain on marketable securities at FVTOCI, net of tax | 19,297 | 29,819
Unrealized (loss) gain on effective portion of derivative, net of tax | (5,215) | 2,226
Acquisition of Alacer | 2,649,355 |
Exercise of stock options | 6,728 |
Settlement of RSUs and PSUs | (14,389) |
Transfer of cash-settled RSUs and PSUs | (3,238) |
Transfer of equity-settled PSUs |  | 1,356
Share-based compensation | 8,494 | 4,005
Acquisition of non-controlling interest |  | (14,300)
Other | (70) |
Ending balance | 3,939,903 | 1,133,954
Other reserves |  |
Disclosure of reserves within equity [line items] |  |
Beginning balance | 19,762 | (16,303)
Acquisition of Alacer | 15,419 |
Exercise of stock options | (2,976) |
Settlement of RSUs and PSUs | (15,632) |
Transfer of cash-settled RSUs and PSUs | (4,138) |
Transfer of equity-settled PSUs |  | 1,356
Share-based compensation | 8,494 | 4,005
Acquisition of non-controlling interest |  | 1,463
Other | 1,046 |
Ending balance | 40,570 | 19,762
Foreign currency translation reserve |  |
Disclosure of reserves within equity [line items] |  |
Beginning balance | 781 | 781
Ending balance |  | 781
Fair value reserve |  |
Disclosure of reserves within equity [line items] |  |
Beginning balance | (5,195) | (37,240)
Gain on marketable securities at FVTOCI, net of tax | 19,297 | 29,819
Unrealized (loss) gain on effective portion of derivative, net of tax | (5,215) | 2,226
Realized loss reclassified to net income | 4,513 | 0
Ending balance | 13,400 | (5,195)
Share-based compensation reserve |  |
Disclosure of reserves within equity [line items] |  |
Beginning balance | 52,253 | 49,696
Acquisition of Alacer | 15,419 | 0
Exercise of stock options | (2,976) | (2,804)
Settlement of RSUs and PSUs | (15,632) | 0
Transfer of cash-settled RSUs and PSUs | (4,138) | 0
Transfer of equity-settled PSUs | 0 | 1,356
Share-based compensation | 8,494 | 4,005
Ending balance | 53,420 | 52,253
Other |  |
Disclosure of reserves within equity [line items] |  |
Beginning balance | (28,077) | (29,540)
Acquisition of non-controlling interest | 0 | 1,463
Other | 1,046 | 0
Ending balance | $ (27,031) | $ (28,077)

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