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EQUITY (Normal course issuer bid Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Feb. 21, 2018
Nov. 01, 2017
Feb. 17, 2017
Dec. 31, 2017
Jan. 01, 2017
Feb. 23, 2017
Disclosure of classes of share capital [line items]            
Number of shares authorized to be repurchased (in shares) 10,960,391 16,117,175       11,512,267
Number of shares authorized to be repurchased as a percentage of issued and outstanding common shares 5.00% 7.00% 5.00%      
Number of shares authorized to be repurchased as a percentage of public float   7.20%        
Shares repurchased for cancellation (in shares)       11,512,267 13,775,248  
Shares repurchased for cancellation       $ 328,616 $ 394,451  
TSX            
Disclosure of classes of share capital [line items]            
Maximum shares to be repurchased daily 114,889          
Average daily trading volume percentage for most recently completed six calendar months 25.00%          
Share capital            
Disclosure of classes of share capital [line items]            
Shares repurchased for cancellation (in shares)       11,512,000 13,775,000  
Shares repurchased for cancellation       $ 7,692 $ 8,626  
Retained earnings            
Disclosure of classes of share capital [line items]            
Shares repurchased for cancellation       $ 320,924 $ 385,825  
Other related parties            
Disclosure of classes of share capital [line items]            
Shares repurchased for cancellation (in shares)       877,000 4,025,000