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Fair value of financial instruments - Disclosure of detailed information about changes in fair value of investments (Details) - Level 3 [Member] - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of fair value measurement of assets [line items]
Balance - January 1	$ 59,600	$ 8,092
Acquisitions	2,885	3,093
Deemed acquisition	0	46,625
Disposal	(58,641)	0
Warrants exercised	(1,055)	0
Balance - December 31	1,700	59,600
Warrants Exercised [Member]
Disclosure of fair value measurement of assets [line items]
Change in fair value	(250)	0
Warrants Expired [Member]
Disclosure of fair value measurement of assets [line items]
Change in fair value	(165)	(1,180)
Investments held at the end of the period [Member]
Disclosure of fair value measurement of assets [line items]
Change in fair value	$ (674)	$ 2,970

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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.

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- Definition

The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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- Definition

The amount of investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Acquisitions

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- Definition

Represents amount related to deemed acquisition of investments.

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- Definition

Represents amount related to disposal of investments.

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- Definition

Represents amount of warrants exercised.

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