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SUPPLEMENTAL CASH FLOW DISCLOSURE (Variations in non-cash transactions) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Jan. 01, 2017
Cash flow statement [Abstract] |  |
Change in classification of non-Treasury RSUs to equity-settled | $ 0 | $ 6,234
Additions to property, plant and equipment and intangible assets included in accounts payable and accrued liabilities | 258 | (8,200)
Proceeds on disposal of property, plant and equipment included in other current assets | 36 | (475)
Assets held for sale transferred to property, plant and equipment | 0 | 2,243
Balance due on business acquisition (note 5) | 2,700 | (4,000)
Non-cash ascribed value credited to contributed surplus for dividends attributed to Treasury RSUs | 447 | 370
Non-cash ascribed value credited to share capital from shares issued or distributed pursuant to vesting of restricted share units and exercise of stock options | $ 9,623 | $ 8,085

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