PENSION, POST-RETIREMENT AND OTHER LONG-TERM EMPLOYEE BENEFITS - Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value of plan assets [line items]
Defined benefit obligations	$ 89,614	$ 82,688
Fair value of plan assets	(60,316)	(51,856)
Deficit in plans	29,298	30,832
US
Disclosure of fair value of plan assets [line items]
Defined benefit obligations	72,643	68,584
Fair value of plan assets	(46,835)	(40,521)
Deficit in plans	25,808	28,063
Canada
Disclosure of fair value of plan assets [line items]
Defined benefit obligations	16,971	14,104
Fair value of plan assets	(13,481)	(11,335)
Deficit in plans	$ 3,490	$ 2,769

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard
-URIDate 2017-03-09

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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- Definition

The present value of the defined benefit obligation, less the fair value of the plan assets (if any). [Refer: Plan assets [member]]

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