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Share-based compensation plans - equity-settled and cash-settled (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total compensation expenses under equity settled plans	$ 18,433	$ 19,305
Expenses (recoveries) under its cash-settled plan	134	(822)
Stock Option Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total compensation expenses under equity settled plans	4,941	4,588
Performance Share Unit Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total compensation expenses under equity settled plans	6,186	5,572
Restricted Share Unit Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total compensation expenses under equity settled plans	2,833	3,941
Employee Share Ownership Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total compensation expenses under equity settled plans	4,473	5,204
Deferred Share Unit Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses (recoveries) under its cash-settled plan	(42)	(739)
Phantom Stock Option Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses (recoveries) under its cash-settled plan	$ 176	$ (83)

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

The amount of expense arising from cash-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2016-01-13
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard
-URIDate 2016-03-31

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- Definition

The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2016-01-13
-Paragraph 51
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_51_a&doctype=Standard
-URIDate 2016-03-31

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