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SHARE-BASED COMPENSATION (Employee share purchase plans) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) shares | Jan. 01, 2017 USD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Compensation expense included in selling, general and administrative expenses | $ | $ 16,065 | $ 15,756
Employee share purchase plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Percentage of payroll deductions from salary to purchase from Treasury (up to) | 10.00% |
Share price as a percentage of current share price | 90.00% |
Service period for share-based compensation plan | 2 years |
Common shares reserved for issuance under the plans (in shares) | shares | 5,000,000 |
Number of shares issued (in shares) | shares | 852,255 | 794,193
Compensation expense included in selling, general and administrative expenses | $ | $ 200 | $ 200

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