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SHARE-BASED COMPENSATION (Stock options and restricted share units Narrative) (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2017
CAD
shares
Jan. 01, 2017
USD ($)
shares
Jan. 01, 2017
CAD
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of common shares issuable pursuant to the exercise of stock options and vesting of Treasury RSUs for the plan (in shares) | shares   12,000,632    
Number of shares remained authorized for future issuance under the plan (in shares) | shares   1,278,661    
Outstanding options exercisable (in shares) | shares   599,562   468,813
Weighted average exercise price of outstanding options exercisable (in CAD per share) | CAD   CAD 26.68   CAD 19.43
Weighted average share price at date of exercise (in CAD per share) | CAD   CAD 39.23   CAD 37.32
Weighted average fair value of options granted (in dollars per share) | $ $ 5.15   $ 4.07  
Compensation expense included in selling, general and administrative expenses and cost of sales | $ $ 16,065,000   $ 15,756,000  
Treasury RSUs        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting period 5 years 5 years    
Percentage of awards contingent on achievement of performance conditions 50.00% 50.00%    
Number of outstanding shares vested (in shares) | shares 0 0 0 0
Compensation expense included in selling, general and administrative expenses and cost of sales | $ $ 900,000   $ 800,000  
Stock options        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Compensation expense included in selling, general and administrative expenses and cost of sales | $ $ 3,800,000   $ 3,700,000  
Non-Treasury RSUs        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting period 3 years 3 years    
Number of outstanding shares vested (in shares) | shares 0 0 0 0
Compensation expense included in selling, general and administrative expenses and cost of sales | $ $ 11,200,000   $ 11,100,000  
Percentage of awards dependent on performance conditions 100.00% 100.00%    
Ratio of awards that can vest to the actual number of shares awarded 2 2