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EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 20, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of outstanding stock maximum   4.50%    
Number of shares available for issuance (in shares)   8,177,272    
Granted (in shares)   0 0  
Proceeds from exercise of stock options   $ 2,628 $ 8,778 $ 6,545
Proceeds from stock options exercised, tax benefit   200    
Stock repurchase program, stock repurchased during period   $ 100,040 $ 148,075  
Common shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock repurchase program, repurchase of common shares (in shares)   6,053,000 8,801,000  
Stock repurchase program, stock repurchased during period   $ 88,849 $ 129,052  
Retained earnings (Accumulated Deficit)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock repurchase program, stock repurchased during period   $ 11,191 $ 19,023  
Normal Course Issuer Bid        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock repurchase program, common shares authorized to be repurchased (in shares) 10,600,000      
Stock repurchase program, period in force 12 months      
Stock repurchase program, repurchase of common shares (in shares)   6,053,126 8,800,700  
Stock repurchased and retired during period, cost per share (in dollars per share)   $ 16.53 $ 16.82  
Stock repurchase program, stock repurchased during period   $ 100,000 $ 148,100  
Normal Course Issuer Bid | Common shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock repurchase program, stock repurchased during period   11,200 19,000  
Normal Course Issuer Bid | Retained earnings (Accumulated Deficit)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock repurchase program, stock repurchased during period   $ 88,800 129,100  
Restricted share units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Unrecognized compensation not yet recognized, period   2 years 8 months 12 days    
Cash used to settle award   $ 0 0 4,600
Granted, fair value   7,300 7,200 25,400
Vested, fair value   14,000 3,300 14,100
Unrecognized compensation not yet recognized   $ 5,300    
Restricted share units | Alacer Gold Corporation        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Expiration period   7 years    
Unrecognized compensation not yet recognized, period   2 months 12 days    
Deferred share units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of automatic redemption   50.00%    
Conversion ratio   1    
Cash used to settle award   $ 3,400 2,700 3,100
Granted and vested, fair value   $ 1,200 1,400 10,700
Deferred share units | Eligible director ceases to be a director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Redemption period   3 months    
Deferred share units | December 31 of the calendar year following the date the eligible director ceases to be a director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Redemption period   15 months    
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation not yet recognized, period   2 years 2 months 12 days    
Cash used to settle award   $ 10,500 14,300 12,000
Granted, fair value   5,500 11,500 24,800
Vested, fair value   9,400 $ 17,400 $ 4,400
Unrecognized compensation not yet recognized   $ 4,700    
Performance Shares | Senior Executives        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Performance Shares | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance target, percentage   0.00%    
Performance Shares | Minimum | Alacer Gold Corporation        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance target, percentage   0.00%    
Performance Shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance target, percentage   200.00%    
Performance Shares | Maximum | Alacer Gold Corporation        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance target, percentage   200.00%