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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)