SHARE-BASED COMPENSATION PLANS - Summary of Company's Share-Based Compensation Liability Balance (Details) - CAD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of terms and conditions of share-based payment arrangement [line items]
Liabilities balance	$ 2,423	$ 4,149
Deferred Share Units
Disclosure of terms and conditions of share-based payment arrangement [line items]
Liabilities balance	1,212	2,360
Restricted Awards
Disclosure of terms and conditions of share-based payment arrangement [line items]
Liabilities balance	754	1,038
Performance Awards
Disclosure of terms and conditions of share-based payment arrangement [line items]
Liabilities balance	$ 457	$ 751

The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 51
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_51_b_i&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_LiabilitiesFromSharebasedPaymentTransactions2011
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant