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TRADE ACCOUNTS RECEIVABLE (Allowance for doubtful accounts) (Details) - Allowance for doubtful accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017
Changes in allowance account for credit losses of financial assets [abstract]
Balance, beginning of fiscal year	$ (5,589)	$ (4,601)
Bad debt recovery (expense)	(3,689)	92
Write-off of trade accounts receivable	4,224	524
Increase due to business acquisitions	0	(1,604)
Balance, end of fiscal year	$ (5,054)	$ (5,589)

X

- Definition

Increase (Decrease) Through Business Acquisitions, Allowance Account For Financial Assets

+ References

No definition available.

+ Details

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X

- Definition

Increase (Decrease) Through Impairment Loss Recognised In Profit Or Loss, Allowance Account For Credit Losses Of Financial Assets

+ References

No definition available.

+ Details

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X

- Definition

Increase (Decrease) Through Recovery (Expense) Recognized During Period For Bad And Doubtful Debts, Allowance Account For Credit Losses Of Financial Assets

+ References

No definition available.

+ Details

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X

- Definition

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=B
-URIDate 2017-03-09

+ Details

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X

- References

No definition available.

+ Details

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- Details

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