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SHARE-BASED COMPENSATION (Stock options and restricted share units Narrative) (Details) | 12 Months Ended
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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 |  |

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