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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