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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