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CURRENT AND DEFERRED INCOME TAX - Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Net balance at beginning of year $ (115,791) $ (29,026)
Recognized in statement of income (27) 1,857
Recognized in OCI 1,242 (7,811)
Acquisition of Seabee Gold Operation 0 (80,811)
Net, ending balance (114,576) (115,791)
Deferred tax assets 0 1,096
Deferred tax liabilities (114,576) (116,887)
Before Offset Amount    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax assets 38,614 42,732
Deferred tax liabilities (153,190) (158,523)
Offset Amount    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax assets (38,614) (41,636)
Deferred tax liabilities 38,614 41,636
Marketable securities    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Net balance at beginning of year (16,949) (7,398)
Recognized in statement of income 0 0
Recognized in OCI 3,744 (9,551)
Acquisition of Seabee Gold Operation 0 0
Net, ending balance (13,205) (16,949)
Marketable securities | Before Offset Amount    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax assets 0 0
Deferred tax liabilities (13,205) (16,949)
Inventory    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Net balance at beginning of year (1,984) (4,882)
Recognized in statement of income (5,260) 5,031
Recognized in OCI 0 0
Acquisition of Seabee Gold Operation 0 (2,133)
Net, ending balance (7,244) (1,984)
Inventory | Before Offset Amount    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax assets 0 0
Deferred tax liabilities (7,244) (1,984)
Property, plant and equipment    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Net balance at beginning of year (96,614) (25,499)
Recognized in statement of income 15,320 1,496
Recognized in OCI 0 0
Acquisition of Seabee Gold Operation 0 (72,611)
Net, ending balance (81,294) (96,614)
Property, plant and equipment | Before Offset Amount    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax assets 1,016 109
Deferred tax liabilities (82,310) (96,723)
Close down and restoration provision    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Net balance at beginning of year 3,917 2,750
Recognized in statement of income (2,130) (308)
Recognized in OCI 0 0
Acquisition of Seabee Gold Operation 0 1,475
Net, ending balance 1,787 3,917
Close down and restoration provision | Before Offset Amount    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax assets 1,787 3,917
Deferred tax liabilities 0 0
Convertible notes    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Net balance at beginning of year (5,497) (6,938)
Recognized in statement of income 1,441 1,441
Recognized in OCI 0 0
Acquisition of Seabee Gold Operation 0 0
Net, ending balance (4,056) (5,497)
Convertible notes | Before Offset Amount    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax assets 0
Deferred tax liabilities (4,056) (5,497)
Carry forward tax loss and tax credits    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Net balance at beginning of year 20,682 16,408
Recognized in statement of income 3,404 (8,247)
Recognized in OCI (2,256) 1,948
Acquisition of Seabee Gold Operation 0 10,573
Net, ending balance 21,830 20,682
Carry forward tax loss and tax credits | Before Offset Amount    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax assets 21,830 20,682
Deferred tax liabilities 0 0
Mining and foreign withholding tax    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Net balance at beginning of year (37,151) (10,694)
Recognized in statement of income (2,076) (1,256)
Recognized in OCI 0 0
Acquisition of Seabee Gold Operation 0 (25,201)
Net, ending balance (39,227) (37,151)
Mining and foreign withholding tax | Before Offset Amount    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax assets 0 0
Deferred tax liabilities (39,227) (37,151)
Other    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Net balance at beginning of year 17,805 7,227
Recognized in statement of income (10,726) 3,700
Recognized in OCI (246) (208)
Acquisition of Seabee Gold Operation 0 7,086
Net, ending balance 6,833 17,805
Other | Before Offset Amount    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Deferred tax assets 13,981 18,024
Deferred tax liabilities $ (7,148) $ (219)