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FINANCIAL INSTRUMENTS (Carrying amounts and fair values) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Jan. 01, 2017
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Financial liabilities at amortised cost | Accounts payable and accrued liabilities |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities, carrying value | $ 255,832 | $ 231,927
Financial liabilities, fair value | 255,832 | 231,927
Financial liabilities at amortised cost | Long-term debt | Effective interest rate |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities, carrying value | 430,000 | 400,000
Financial liabilities, fair value | 430,000 | 400,000
Financial liabilities at amortised cost | Long-term debt | Fixed interest rate |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities, carrying value | 200,000 | 200,000
Financial liabilities, fair value | 197,600 | 192,500
Derivative financial instruments designated as effective hedging instruments included in accounts payable and accrued liabilities |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities, carrying value | 2,644 | 1,515
Financial liabilities, fair value | 2,644 | 1,515
Derivative financial instruments included in accounts payable and accrued liabilities - total return swap |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial liabilities, carrying value | 0 | 620
Financial liabilities, fair value | 0 | 620
Financial assets at amortised cost | Cash and cash equivalents |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 52,795 | 38,197
Financial assets, fair value | 52,795 | 38,197
Financial assets at amortised cost | Trade accounts receivable |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 243,365 | 277,733
Financial assets, fair value | 243,365 | 277,733
Financial assets at amortised cost | Financial assets included in prepaid expenses, deposits and other current assets |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 28,711 | 22,722
Financial assets, fair value | 28,711 | 22,722
Financial assets at amortised cost | Long-term non-trade receivables included in other non-current assets |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 2,781 | 476
Financial assets, fair value | 2,781 | 476
Derivative financial instruments designated as effective hedging instruments included in prepaid expenses, deposits and other current assets |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 15,688 | 32,572
Financial assets, fair value | 15,688 | 32,572
Derivative financial instruments included in prepaid expenses, deposits and other current assets - total return swap |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |
Financial assets | 1,232 | 0
Financial assets, fair value | $ 1,232 | $ 0

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- Definition [Line Items] for Disclosure Of Financial Assets And Liabilities [Table] + References No definition available. + Details
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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35H&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35I&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35M&doctype=Standard -URIDate 2017-03-09 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35N&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 + Details
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